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2010 2011 BMW 5 Series Forum F10 P0171 System too lean - weird issues with BMW N20 |
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03-13-2024, 06:37 AM | #1 |
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P0171 System too lean - weird issues with BMW N20
Hi all, I'm getting really fed up in finding the root cause of my 2012 F10 N20 supposedly running lean. I hope there's someone with an automotive major reads this and able to advise me.
I was able to read my STFT and LTFT using a bluetooth ODB scanner connected to my phone. Findings: I have a varying SFTF readings (Sometimes +10+% and sometimes -10+) I have a consistently high LTFT in the +20+% which so high that my fuel consumption increased a lot and only getting about 320KM on a full tank in the city 10.0.0.0.1. It gets weird.... When I increase the rev, sometimes LTFT goes down (Signs of vacuum leak) When I increase the rev, sometimes LTFT goes up (Signs of fuel delivery issue) I can't get around the fact why it's not consistent. Can I have both issue present? I have brought it to few shops, no one detected any vacuum leak Parts replaced: 4 new coils and plugs New HPFP and 4 new injectors New oxygen sensors (Both down and upstream sensor) New MAF sensor A lot of $$$ gone down the drain and none fixes the issue. Last edited by minny; 03-17-2024 at 09:09 AM.. |
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