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      03-21-2013, 11:41 PM   #1
Fen335i
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error codes - help needed

Hi Guys - I have two error codes being thrown. Anyone know what the solution is to fix the issues?:

1) 274B Lambda sensor pump current assimilation error VKAT bank 2

2) 27B0 Secondary air system throughput bank 1 (2)
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      03-22-2013, 01:01 AM   #2
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Quote:
Originally Posted by Fen335i View Post
Hi Guys - I have two error codes being thrown. Anyone know what the solution is to fix the issues?:

1) 274B Lambda sensor pump current assimilation error VKAT bank 2

2) 27B0 Secondary air system throughput bank 1 (2)
274B - P2629
Oxygen sensor pump current calibration fault before cat. converter, bank 2
O2 Sensor Pumping Current Trim Circuit/Open (Bank 2 Sensor 1)

Oxygen sensor is available, oxygen sensor voltage > 4951 mV (K_LAVK_OBD_SA_DIAG_OL)

Terminal condition: Engine running - overrun condition

After a defined SA phase the lag period K_LAVK_OBD_SA_T (2.5 sec) must be completed

1. Check plug and wiring harness on pre-cat oxygen sensor LSVK B2 (especially trim circuit wire IA),
2. If OK, replace oxygen sensor

MIL lamp on after engine runs 2x /Small influence on drivability


27B0 - P0491
Secondary air system flow rate, bank 1
Secondary Air Injection System Insufficient Flow (Bank 1)

sls_obdh_mdf_max_intg_norm (after roughly 30s)<K_SLS_OBDH_MDF_MIN_DEF and sls_obdh_lam_asv_intg_norm < k_SLS_OBDH_MDF_2_MAG or sls_obdh_lam_asv_intg_norm < k_SLS_OBDH_ASV_LI_OPE and K_SLS_OBDH_MDF_MIN_DEF>K_SLS_OBDH_MDF_MAX_DEF

Battery voltage > 10.8 V (k_sls_obd_ub_min)

Condition for fault memory entry: 30000 ms

1. Disconnect secondary air line
2. Carry out test routine
3. If flow is too high, replace the ASV
4. Otherwise check Line 1 for obstructions and replace as indicated

My Suggestion:
Replace bank 2 sensor 1 oxygen sensor, clear faults, and see if SES light returns.
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      03-22-2013, 11:20 AM   #3
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Thanks Mike, much appreciated! Since I'm a newbie with fault codes, what precat 02 sensor is "bank 2, sensor 1". Is that driver side before the primary cats, or passenger side?

Anyone know of the cheapest place to buy these? Are there "cheap" 02 sensors being sold today that I should stay away from?

Thanks!
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