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Registered User
Join Date: Feb 2020
Posts: 2
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P0171 & P0087 DTC for N55
2011 535i has low power and long start. CEL on w/ P0171 and P0087. Low fuel rail pressure and lean bank. There is so much out there on the HPFP and the LPFP having issues that it has my head spinning. Not to mention the fuel pressure sensor issues too. Trying to determine a plan of action to diagnose the correct problem without replacing all three parts?
No misfire codes. I am getting DMTL short to positive codes also, but I think it's unrelated to my fuel pressure issue. |
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02-07-2020, 07:37 PM
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Registered User
Join Date: Feb 2020
Posts: 2
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Hpfp
Turned out to be the HPFP under the hood. All good now.
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02-10-2020, 06:21 PM
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