can SAP issue cause O2 sensor faults?

kolosy · 09-28-2023, 11:42 AM

I've got 2743 and 274B popping up -- "Oxygen sensor heater resistance" pre-cat, bank 2, and "Oxygen sensor pump current calibration error" pre-cat bank 2.

Car is tuned and catless. I replaced the O2 sensor and am still getting the error. I've also occasionally seen a SAP bank 2 error, I'm wondering if that could be causing the O2 codes too? I bought a set of donut gaskets to try as a next step, but I did just have the entire exhaust off for DCT work and would imagine the shop would've put in new gaskets if they were leaking...

alamo89 · 10-24-2023, 03:32 AM

Im having the same issue with mine. Catless, tune + new exhaust gaskets and now having weird idle when cold.

kolosy · 10-24-2023, 09:24 AM

weird idle is likely the fuel breather valve, it's a common issue. are you having the codes i'm getting too?

09-28-2023, 11:42 AM	#1
kolosy Colonel 1709 Rep 2,229 Posts Drives: over potholes Join Date: Dec 2008 Location: Chicago iTrader: (2)	can SAP issue cause O2 sensor faults? I've got 2743 and 274B popping up -- "Oxygen sensor heater resistance" pre-cat, bank 2, and "Oxygen sensor pump current calibration error" pre-cat bank 2. Car is tuned and catless. I replaced the O2 sensor and am still getting the error. I've also occasionally seen a SAP bank 2 error, I'm wondering if that could be causing the O2 codes too? I bought a set of donut gaskets to try as a next step, but I did just have the entire exhaust off for DCT work and would imagine the shop would've put in new gaskets if they were leaking... __________________ Current '21 DG X5MC, '22 BG G82, '11 E90 M3 Recent Past '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 I think I have an M3 problem.
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10-24-2023, 03:32 AM	#2
alamo89 Private 10 Rep 84 Posts Drives: M3 Join Date: Mar 2016 Location: DMV iTrader: (0)	Im having the same issue with mine. Catless, tune + new exhaust gaskets and now having weird idle when cold.
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10-24-2023, 09:24 AM	#3
kolosy Colonel 1709 Rep 2,229 Posts Drives: over potholes Join Date: Dec 2008 Location: Chicago iTrader: (2)	weird idle is likely the fuel breather valve, it's a common issue. are you having the codes i'm getting too? __________________ Current '21 DG X5MC, '22 BG G82, '11 E90 M3 Recent Past '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 I think I have an M3 problem.
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