BMW ECU Error Codes Described (Pxxx codes as well)

[regular guy]

275D - P0171

275D - P0171
Information saved in	DME
Fault code	275D - P0171
Fault text	Oxygen sensor limit position fault, bank 1
Fault description	System Too Lean (Bank 1)
Condition for fault identification	Test condition: Controller pegged at the MIN threshold 0.75 (K_LAM_REG_F_MIN) for at least a period of 30 sec. K_LAM_DIAG_REG_T
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	Controller limit for K_LAM_DIAG_REG_T (60s)
Action in service	1. Check fuel system for leaks, initiate test routine as indicated
	2. Check exhaust system for leaks
	3. Check HFM for leaks and correct operation
	4. Read out oxygen sensor diagnostic data, perform both oxygen sensor test routines as indicated
Fault effect and breakdown warning	Engine runs erratically
	Potential collateral error: Miss errors and lamda error MIL after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

275D - P0172

275D - P0172
Information saved in	DME
Fault code	275D - P0172
Fault text	Oxygen sensor limit position fault, bank 1
Fault description	System Too Rich (Bank 1)
Condition for fault identification	Test condition: Controller pegged at MAX threshold 1.25 (K_LAM_REG_F_MAX) for time of at least 30 sec. (K_LAM_DIAG_REG_T)
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	Controller limit for K_LAM_DIAG_REG_T (60s)
Action in service	1. Check fuel system for leaks, initiate test routine as indicated
	2. Check exhaust system for leaks
	3. Check HFM for leaks and correct operation
	4. Read out oxygen sensor diagnostic data, perform both oxygen sensor test routines as indicated
Fault effect and breakdown warning	Engine runs erratically
	Potential collateral error: Miss errors and lamda error MIL after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

[regular guy]

27BA - P0171

27BA - P0171
Information saved in	DME
Fault code	27BA - P0171
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Lean (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

27BA - P0171

27BA - P0171
Information saved in	DME
Fault code	27BA - P0171
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Lean (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX * expansion factor (KL_FPLAU_OBD_LAM_CSS_F)
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

27BA - P2177

27BA - P2177
Information saved in	DME
Fault code	27BA - P2177
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Lean Off Idle (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

27BA - P2177

27BA - P2177
Information saved in	DME
Fault code	27BA - P2177
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Lean Off Idle (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX * expansion factor (KL_FPLAU_OBD_LAM_CSS_F)
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

27BA - P0172

27BA - P0172
Information saved in	DME
Fault code	27BA - P0172
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Rich (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

27BA - P0172

27BA - P0172
Information saved in	DME
Fault code	27BA - P0172
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Rich (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX * expansion factor (KL_FPLAU_OBD_LAM_CSS_F)
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

27BA - P2178

27BA - P2178
Information saved in	DME
Fault code	27BA - P2178
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Rich Off Idle (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

27BA - P2178

27BA - P2178
Information saved in	DME
Fault code	27BA - P2178
Fault text	Fuel system, lambda/charge plausibility, bank 1
Fault description	System Too Rich Off Idle (Bank 1)
Condition for fault identification	Test condition: Deviation from mean value (depending on psau, lam, aq) in percent is determined and compared with the max. deviation (in relation to rpm/load factor) KF_FPLAU_OBD_LAM_DELTA_ML_MAX * expansion factor (KL_FPLAU_OBD_LAM_CSS_F)
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	10000 ms
Action in service	1. Check the fuel system for leaks
	2. System test routine
	3. HFM and charge path must be flawless.
	4. Defective fuel pressure sensor
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

[BPMSport]

Originally Posted by tmntmn

Do you know what codes 2789 and 278a are

Thanks

Cat efficiency bank 1 and 2.

Same as P0420 and P0430

If you have Catless exhaust or high flow cats without a tune, these are the two faults you will get.

[Petros]

What about 273B

[regular guy]

273B - P2273

273B - P2273
Information saved in	DME
Fault code	273B - P2273
Fault text	Oxygen sensor vibration check behind catalytic converter, bank 2
Fault description	O2 Sensor Signal Biased/Stuck Rich (Bank 2 Sensor 2)
Condition for fault identification	Test condition: Trim control suspicion with observation of P component and I component leads to guided LEAN control; if the post-cat oxygen sensor signal fails to respond accordingly, the error is assigned to the post-cat oxygen sensor
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	After K_LAVK_OBD_ACT_NK_M_CNT (1x) LEAN control events the oxygen sensor remains stuck at RICH
Action in service	1. Check exhaust system for leaks
	2. If OK, replace post-cat oxygen sensor LSNK B2
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

273B - P0156

273B - P0156
Information saved in	DME
Fault code	273B - P0156
Fault text	Oxygen sensor vibration check behind catalytic converter, bank 2
Fault description	O2 Sensor Circuit (Bank 2 Sensor 2)
Condition for fault identification	Test condition: Oxygen sensor signal too low, low threshold 649 mV (K_LANK_OBD_S_VL_US) for 2 (K_LANK_OBD_S_CNT) /K_LANK_OBD_S_AUTOM_CNT requests
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	Full-load K_LANK_OBD_S_VL_T (6s) for K_LANK_OBD_S_CNT (3x) /K_LANK_OBD_S_AUTOM_CNT (3x) attempts
Action in service	1. Check exhaust system for leaks
	2. If OK, replace post-cat oxygen sensor LSNK B2
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

273B - P014A

273B - P014A
Information saved in	DME
Fault code	273B - P014A
Fault text	Oxygen sensor vibration check behind catalytic converter, bank 2
Fault description	O2 Sensor Delayed Response - Rich to Lean (Bank 2 Sensor 2)
Condition for fault identification	Test condition: * Determine whether oxygen sensor voltage remains above 649 mV (K_LANK_OBD_S_SA_US)
	* Fault after 2 (K_LANK_OBD_S_CNT)/K_LANK_OBD_S_AUTOM_CNT attempts
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	Time K_LANK_OBD_S_SA_T (3s) after SA for K_LANK_OBD_S_CNT (2x) /K_LANK_OBD_S_AUTOM_CNT (3x) tries
Action in service	1. Check exhaust system for leaks
	2. If OK, replace post-cat oxygen sensor LSNK B2
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

273B - P2272

273B - P2272
Information saved in	DME
Fault code	273B - P2272
Fault text	Oxygen sensor vibration check behind catalytic converter, bank 2
Fault description	O2 Sensor Signal Biased/Stuck Lean (Bank 2 Sensor 2)
Condition for fault identification	Test condition: Trim control suspicion with observation of P component and I component leads to guided RICH control; if the post-cat oxygen sensor signal fails to respond accordingly, the error is assigned to the post-cat oxygen sensor
	Terminal condition: Engine running
	Voltage condition: none
Condition for fault memory entry	After K_LAVK_OBD_ACT_NK_F_CNT (1x) RICH control events the oxygen sensor sticks at LEAN
Action in service	1. Check exhaust system for leaks
	2. If OK, replace post-cat oxygen sensor LSNK B2
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

[regular guy]

2789 - P0420

2789 - P0420
Information saved in	DME
Fault code	2789 - P0420
Fault text	Catalytic-converter conversion, bank 1
Fault description	Catalyst System Efficiency Below Threshold (Bank 1)
Condition for fault identification	Test condition: Diagnosis value above threshold K_KAT_OBD_WERT_MAX
	Terminal condition: Engine running - Condition idle or part-load
	Voltage condition: none
Condition for fault memory entry	none
Action in service	1. Check exhaust system for leaks
	2. No faults related to oxygen sensor or fuel system or VANOS should be present
	3. Conduct oxygen sensor test routines, even if no oxygen sensor fault is present.
	4. Replace catalytic conveter near engine
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

[regular guy]

278A - P0430

278A - P0430
Information saved in	DME
Fault code	278A - P0430
Fault text	Catalytic-converter conversion, bank 2
Fault description	Catalyst System Efficiency Below Threshold (Bank 2)
Condition for fault identification	Test condition: Diagnosis value above threshold K_KAT_OBD_WERT_MAX
	Terminal condition: Engine running - Condition idle or part-load
	Voltage condition: none
Condition for fault memory entry	none
Action in service	1. Check exhaust system for leaks
	2. No faults related to oxygen sensor or fuel system or VANOS should be present
	3. Conduct oxygen sensor test routines, even if no oxygen sensor fault is present.
	4. Replace catalytic conveter near engine
Fault effect and breakdown warning	MIL on after engine runs 2x
Driver information	Warning light: MIL
Service instruction	None

[regular guy]

2B15 - P1636

2B15 - P1636
Information saved in	DME
Fault code	2B15 - P1636
Fault text	Throttle-valve actuator, governor monitoring, bank 1
Fault description	Throttle Valve Circuit (Bank 1)
Condition for fault identification	Test condition: Actuator shifts to Failsafe mode
	Terminal condition: TERM87
	Voltage condition: None
Condition for fault memory entry	10 ms
Action in service	1. Clear fault memory, conduct EDR electronic throttle valve control system test,
	2. Check plug and wiring harness at throttle valve sensor DKG1 and electronic throttle valve control EDR1,
	3. Replace DKG1 or EDR for Bank 1
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

2B15 - P2100

2B15 - P2100
Information saved in	DME
Fault code	2B15 - P2100
Fault text	Throttle-valve actuator, governor monitoring, bank 1
Fault description	Throttle Actuator 'A' Control Motor Circuit/Open
Condition for fault identification	Test condition: Actuator shifts to Failsafe mode
	Terminal condition: TERM87
	Voltage condition: None
Condition for fault memory entry	10 ms
Action in service	1. Clear fault memory, conduct EDR electronic throttle valve control system test,
	2. Check plug and wiring harness at throttle valve sensor DKG1 and electronic throttle valve control EDR1,
	3. Replace DKG1 or EDR for Bank 1
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

2B15 - P0638

2B15 - P0638
Information saved in	DME
Fault code	2B15 - P0638
Fault text	Throttle-valve actuator, governor monitoring, bank 1
Fault description	Throttle Actuator Control Range/Performance (Bank 1)
Condition for fault identification	Test condition: Actuator reports system error
	Terminal condition: TERM87
	Voltage condition: None
Condition for fault memory entry	10 ms
Action in service	1. Clear fault memory, conduct EDR electronic throttle valve control system test,
	2. Check plug and wiring harness at throttle valve sensor DKG1 and electronic throttle valve control EDR1,
	3. Replace DKG1 or EDR for Bank 1
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

2B15 - P0638

2B15 - P0638
Information saved in	DME
Fault code	2B15 - P0638
Fault text	Throttle-valve actuator, governor monitoring, bank 1
Fault description	Throttle Actuator Control Range/Performance (Bank 1)
Condition for fault identification	Test condition: Actuator reports regulator error
	Terminal condition: TERM87
	Voltage condition: None
Condition for fault memory entry	10 ms
Action in service	1. Clear fault memory, carry out EDR electronic throttle valve control system test,
	2. Check plug and wiring harness to throttle valve sensor DKG1 and EDR1,
	3. Replace DKG1 or EDR Bank 1,
	4. With UMWB engine protection check throttle valve assembly for stiction
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

[regular guy]

2B25 - P154C

2B25 - P154C
Information saved in	DME
Fault code	2B25 - P154C
Fault text	Throttle-valve monitoring, bank 1
Fault description	Throttle Actuator Monitoring Dissimilar Desired Values (Bank 1)
Condition for fault identification	Test condition: Difference too large
	Terminal condition: TERM87
	Voltage condition: Battery voltage > 6.8V (k_egas_can_ed_ub_min)
Condition for fault memory entry	300 ms
Action in service	1. Clear fault memory, EDR system test
	2. Check plug, wiring harness and power supply to EDR1
	3. Replace EDR1
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

2B25 - P154D

2B25 - P154D
Information saved in	DME
Fault code	2B25 - P154D
Fault text	Throttle-valve monitoring, bank 1
Fault description	Throttle Actuator Monitoring Incorrect Actual Value (Bank 1)
Condition for fault identification	Test condition: Difference too large
	Terminal condition: TERM87
	Voltage condition: Battery voltage > 6.8V (k_egas_can_ed_ub_min)
Condition for fault memory entry	300 ms
Action in service	1. Clear fault memory, EDR electronic throttle valve control system test,
	2. Check 2nd plug, wiring harness and power supply for throttle valve DK1, EDR1 and DME,
	3. Replace DK1
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

2B25 - P154E

2B25 - P154E
Information saved in	DME
Fault code	2B25 - P154E
Fault text	Throttle-valve monitoring, bank 1
Fault description	Throttle Actuator Monitoring Actual Value / Desired Value Correlation (Bank 1)
Condition for fault identification	Test condition: Difference too large
	Terminal condition: TERM87
	Voltage condition: Battery voltage > 6.8V (k_egas_can_ed_ub_min)
Condition for fault memory entry	350 ms
Action in service	1. Clear fault memory, EDR electronic throttle valve control system test,
	2. Check plug, wiring harness and power supply to throttle valve DK1 and EDR1
	3. Check throttle valve assembly B1 for mechanical stiction
	4. Replace DK1
	5. Replace EDR1
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

2B25 - P154F

2B25 - P154F
Information saved in	DME
Fault code	2B25 - P154F
Fault text	Throttle-valve monitoring, bank 1
Fault description	Throttle Actuator Monitoring Reset Error (Bank 1)
Condition for fault identification	Test condition: Not identical for too long
	Terminal condition: TERM87
	Voltage condition: Battery voltage > 6.8V (k_egas_can_ed_ub_min)
Condition for fault memory entry	250 ms
Action in service	1. Clear fault memory, EDR system test
	2. Check plug, wiring harness and power supply to EDR1
	3. Replace EDR1
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

[regular guy]

2779 - P0442

2779 - P0442
Information saved in	DME
Fault code	2779 - P0442
Fault text	DMTL leakage detection
Fault description	Evaporative Emission System Leak Detected (small leak)
Condition for fault identification	Test condition: Current rise during diagnosis less then (dmtl_i_ref - dmtl_i_min) x 0.21 (K_DMTL_I_FAKT_GROB) + dmtl_i_min
	Terminal condition: TERM15 off
	Voltage condition: 11V < UBatt < 14.5V (k_dmtl_ub_min ; k_dmtl_ub_max), with start using tester: None
Condition for fault memory entry	None
Action in service	1. Check filler cap seal
	2. Pressurize tank and search for leaks
Fault effect and breakdown warning	CC message / possible gasoline odor
Driver information	Warning light: MIL, CC message
Service instruction	None

[regular guy]

277C - P114A

277C - P114A
Information saved in	DME
Fault code	277C - P114A
Fault text	Oxygen sensor trim control diagnosis, bank 1
Fault description	Post Catalyst Fuel Trim Via Oxygen Sensor System Too Rich (Bank 1)
Condition for fault identification	Test condition: LEAN suspected under consideration of P-component ((6 (K_LA_TRIM_P_ANZ_MAX) + 3 (K_LA_TRIM_DIAG_P_SCHW P-spikes)) leads to deliberate RICH/LEAN control activation; if the pre-catalyst and post-catalyst oxygen sensors respond accordingly a trim control error is recognized.
	Terminal condition: Engine running
	Voltage condition: None
Condition for fault memory entry	None
Action in service	1) Check intake and exhaust systems for leaks; incl. HFM operation/ ..if no fault is present..
	2.) Conduct oxygen sensor test routine
	3.) If the test does not produce any results and the trim control error is still present ->Replace the sensor before the catalytic converter
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

277C - P114B

277C - P114B
Information saved in	DME
Fault code	277C - P114B
Fault text	Oxygen sensor trim control diagnosis, bank 1
Fault description	Post Catalyst Fuel Trim Via Oxygen Sensor System Too Lean (Bank 1)
Condition for fault identification	Test condition: LEAN suspected under consideration of P-component ((6 (K_LA_TRIM_P_ANZ_MAX) + 3 (K_LA_TRIM_DIAG_P_SCHW P-spikes)) leads to deliberate RICH/LEAN control activation; if the pre-catalyst and post-catalyst oxygen sensors respond accordingly a trim control error is recognized.
	Terminal condition: Engine running
	Voltage condition: None
Condition for fault memory entry	None
Action in service	1) Check intake and exhaust systems for leaks; incl. HFM operation/ ..if no fault is present..
	2.) Conduct oxygen sensor test routine
	3.) If the test does not produce any results and the trim control error is still present ->Replace the sensor before the catalytic converter
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

277C - P114A

277C - P114A
Information saved in	DME
Fault code	277C - P114A
Fault text	Oxygen sensor trim control diagnosis, bank 1
Fault description	Post Catalyst Fuel Trim Via Oxygen Sensor System Too Rich (Bank 1)
Condition for fault identification	Test condition: LEAN suspected under consideration of I-component (( 2 (K_LA_TRIM_DIAG_I_MIN_SCHW) recognition of I-component limit) leads to deliberate RICH/LEAN control activation; If the pre-catalyst and post-catalyst oxygen sensors respondaccordingly a trim control error is recognized.
	Terminal condition: Engine running
	Voltage condition: None
Condition for fault memory entry	None
Action in service	1) Check intake and exhaust systems for leaks; incl. HFM operation/ ..if no fault is present..
	2.) Conduct oxygen sensor test routine
	3.) If the test does not produce any results and the trim control error is still present ->Replace the sensor before the catalytic converter
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

277C - P2097

277C - P2097
Information saved in	DME
Fault code	277C - P2097
Fault text	Oxygen sensor trim control diagnosis, bank 1
Fault description	Post Catalyst Fuel Trim System Too Rich (Bank 1)
Condition for fault identification	Test condition: LEAN suspected under consideration of I-component (( 2 (K_LA_TRIM_DIAG_I_MIN_SCHW) recognition of I-component limit) leads to deliberate RICH/LEAN control activation; If the pre-catalyst and post-catalyst oxygen sensors respond accordingly a trim control error is recognized.
	Terminal condition: Engine running
	Voltage condition: None
Condition for fault memory entry	None
Action in service	1) Check intake and exhaust systems for leaks; incl. HFM operation/ ..if no fault is present..
	2.) Conduct oxygen sensor test routine
	3.) If the test does not produce any results and the trim control error is still present ->Replace the sensor before the catalytic converter
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

277C - P114B

277C - P114B
Information saved in	DME
Fault code	277C - P114B
Fault text	Oxygen sensor trim control diagnosis, bank 1
Fault description	Post Catalyst Fuel Trim System Too Lean (Bank 1)
Condition for fault identification	Test condition: RICH suspected under consideration of I-component (( 2 (K_LA_TRIM_DIAG_I_MAX_SCHW) recognition of I-component limit) leads to deliberate RICH/LEAN control activation; If the pre-catalyst and post-catalyst oxygen sensors respond accordingly a trim control error is recognized.
	Terminal condition: Engine running
	Voltage condition: None
Condition for fault memory entry	None
Action in service	1) Check intake and exhaust systems for leaks; incl. HFM operation/ ..if no fault is present..
	2.) Conduct oxygen sensor test routine
	3.) If the test does not produce any results and the trim control error is still present ->Replace the sensor before the catalytic converter
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

277C - P2096

277C - P2096
Information saved in	DME
Fault code	277C - P2096
Fault text	Oxygen sensor trim control diagnosis, bank 1
Fault description	Post Catalyst Fuel Trim System Too Lean (Bank 1)
Condition for fault identification	Test condition: RICH suspected under consideration of I-component (( 2 (K_LA_TRIM_DIAG_I_MAX_SCHW) recognition of I-component limit) leads to deliberate RICH/LEAN control activation; If the pre-catalyst and post-catalyst oxygen sensors respond accordingly a trim control error is recognized.
	Terminal condition: Engine running
	Voltage condition: None
Condition for fault memory entry	None
Action in service	1) Check intake and exhaust systems for leaks; incl. HFM operation/ ..if no fault is present..
	2.) Conduct oxygen sensor test routine
	3.) If the test does not produce any results and the trim control error is still present ->Replace the sensor before the catalytic converter
Fault effect and breakdown warning	MIL on after engine runs 2x / no effects on drivability
Driver information	Warning light: MIL
Service instruction	None

[regular guy]

273D - P2415

273D - P2415
Information saved in	DME
Fault code	273D - P2415
Fault text	Oxygen sensor, part/full-load diagnosis, before cat., bank 2
Fault description	O2 Sensor Exhaust Sample Error (Bank 2 Sensor 1)
Condition for fault identification	Test condition: Oxygen sensor voltage less than 4800 mV (K_LAVK_OBD_TL_SCHW_MAX) and greater than 3149 mV (K_LAVK_OBD_TL_SCHW_MIN) for a total of 1 (K_LAVK_OBD_TL_CNT) after a lag period before active functionality of 8s (K_LAVK_OBD_TL_T) seconds
	Terminal condition: Engine running - Condition part-load or full-load
	Voltage condition: None
Condition for fault memory entry	K_LAVK_OBD_TL_T- seconds (8s) lag for K_LAVK_OBD_TL_CNT-attempts (1x)
Action in service	1. Install oxygen sensor in exhaust system (oxygen sensor exposed to ambient air)
Fault effect and breakdown warning	MIL on after engine runs 2x
	Possible negative effects on drivability
Driver information	Warning light: MIL
Service instruction	None

[regular guy]

2B4C - P0111

2B4C - P0111
Information saved in	DME
Fault code	2B4C - P0111
Fault text	Intake-air temperature sensor, plausibility
Fault description	Intake Air Temperature Sensor 1 Circuit Range/Performance (Bank 1)
Condition for fault identification	Test condition: Engine runs with limited dynamic response in part-load range
	Terminal condition: Engine running
	Voltage condition: None
Condition for fault memory entry	30 s
Action in service	1. Check plug and wiring harness at temperature sensor B1
	2. Replace temperature sensor B1
Fault effect and breakdown warning	Driver does not notice
Driver information	Warning light: MIL
Service instruction	None

[Wei718]

Any idea what fault code P1118 means?

[Facsombh]

Can you check what P0500 means..

[regular guy]

2B13 - P0500

2B13 - P0500
Information saved in	DME
Fault code	2B13 - P0500
Fault text	Speed recording
Fault description	Vehicle Speed Sensor 'A'
Condition for fault identification	Test condition: v_direct == 0
	Terminal condition: TERM87
	Voltage condition: None
Condition for fault memory entry	120 ms
Action in service	1. Read out stored error codes logged in DSC
	2. Check wire and/or sensor
Fault effect and breakdown warning	Engine speed governed to K_N_BEGR_V_FEHLER
Driver information	Warning light: MIL
Service instruction	None

[Facsombh]

Originally Posted by regular guy

2B13 - P0500

thank you !

[Petros]

What about CDB6, 2AF9, 2B61, and 2B20?

[regular guy]

2AF9 - P0116

2AF9 - P0116
Information saved in	DME
Fault code	2AF9 - P0116
Fault text	Coolant temperature sensor
Fault description	Engine Coolant Temperature Sensor 1 Circuit Range/Performance
Condition for fault identification	Test condition: (Measured value + 20°Kelvin (K_TMOT_SK_DELTA) < oil temperature
	Terminal condition: None
	Voltage condition: None
Condition for fault memory entry	2000 ms
Action in service	1. Check plug and wiring harness,
	2. Replace coolant temperature sensor
Fault effect and breakdown warning	MIL lamp comes on after engine runs 2x / idle may be high for brief period after engine start
Driver information	Warning light: MIL
Service instruction	None

2AF9 - P0117

2AF9 - P0117
Information saved in	DME
Fault code	2AF9 - P0117
Fault text	Coolant temperature sensor
Fault description	Engine Coolant Temperature Sensor 1 Circuit Low
Condition for fault identification	Test condition: Measured value >= 136°C (K_TMOT_DIAG_MAX)
	Terminal condition: None
	Voltage condition: None
Condition for fault memory entry	2000 ms
Action in service	1. Check plug and wiring harness,
	2. Replace coolant temperature sensor
Fault effect and breakdown warning	MIL lamp comes on after engine runs 2x / idle may be high for brief period after engine start
Driver information	Warning light: MIL
Service instruction	None

2AF9 - P0118

2AF9 - P0118
Information saved in	DME
Fault code	2AF9 - P0118
Fault text	Coolant temperature sensor
Fault description	Engine Coolant Temperature Sensor 1 Circuit High
Condition for fault identification	Test condition: Measured value >= 136°C (K_TMOT_DIAG_MAX)
	Terminal condition: None
	Voltage condition: None
Condition for fault memory entry	2000 ms
Action in service	1. Check plug and wiring harness,
	2. Replace coolant temperature sensor
Fault effect and breakdown warning	MIL lamp comes on after engine runs 2x / idle may be high for brief period after engine start
Driver information	Warning light: MIL
Service instruction	None

2AF9 - P3198

2AF9 - P3198
Information saved in	DME
Fault code	2AF9 - P3198
Fault text	Coolant temperature sensor
Fault description	Engine Coolant Temperature 1 Gradient Too High
Condition for fault identification	Test condition: Measured value gradient > 1 K/100 ms (K_TMOT_DIAG_GRAD_MAX)
	Terminal condition: None
	Voltage condition: None
Condition for fault memory entry	2000 ms
Action in service	1. Check plug and wiring harness,
	2. Replace coolant temperature sensor
Fault effect and breakdown warning	MIL lamp comes on after engine runs 2x / idle may be high for brief period after engine start
Driver information	Warning light: MIL
Service instruction	None

[regular guy]

2B20 - P0222

2B20 - P0222
Information saved in	DME
Fault code	2B20 - P0222
Fault text	Throttle-valve sensor, bank 2
Fault description	Throttle/Pedal Position Sensor/Switch 'B' Circuit Low
Condition for fault identification	Test condition: Measured value <= 0.2V (K_EGAS_WDK_MIN)
	Terminal condition: TERM87
	Voltage condition: None
Condition for fault memory entry	100 ms
Action in service	1. Check plug and wiring harness,
	2. Check installation of throttle valve sensor DKG2,
	3. Replace DKG2
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

2B20 - P0223

2B20 - P0223
Information saved in	DME
Fault code	2B20 - P0223
Fault text	Throttle-valve sensor, bank 2
Fault description	Throttle/Pedal Position Sensor/Switch 'B' Circuit High
Condition for fault identification	Test condition: Measured value >= 4.8V (K_EGAS_WDK_MAX)
	Terminal condition: TERM87
	Voltage condition: None
Condition for fault memory entry	100 ms
Action in service	1. Check plug and wiring harness,
	2. Check installation of throttle valve sensor DKG2,
	3. Replace DKG2
Fault effect and breakdown warning	CC message
	Engine speed limited
	Reduced power
	MIL after engine runs 2x
Driver information	Warning light: MIL, EML, CC message, backup program
Service instruction	None

[regular guy]

Originally Posted by Petros

What about CDB6, 2AF9, 2B61, and 2B20?

CDB6 - UNK01, Post-88
2AF9 - P0116, Post-85
2B61 - DME - Gearbox input speed/sensor slipping clutch (no further information on 2B61)
2B20 - P0222, Post-86

[regular guy]

CDB6

CDB6
Information saved in	DME
Fault code	CDB6
Fault text	Diagnosis monitors the required torque.
Fault description	Malfunction monitoring conditions The fault is detected if the torque is higher than the required torque.
Condition for fault identification	Test condition:
	Temperature condition - None
	Time condition - None
	Other preconditions - None
	Terminal status - Terminal 15
	Voltage precondition: Vehicle voltage between 9V and 16V
Condition for fault memory entry	The fault is entered immediately.
Action in service	Carry out bus system analysis
Fault effect and breakdown warning	None
Driver information	None
Service instruction	None

I found this description on BMW ISTA, but can't guarantee it's for M3.