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please help me

  • Ben999walker
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5 years 3 weeks ago #42635 by Ben999walker
please help me was created by Ben999walker
I have a 2002 nissan altima 3.5 that has been rebuilt with many aftermarket parts. I am getting the P0171 Bank 1 lean code. I just tried to read my fuel trim info but idk what I'm doing.
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5 years 3 weeks ago #42638 by guafa
Replied by guafa on topic please help me
Hi Ben,

LTFT bank 1 is telling you PCM is adding fuel for a long period (recorded in memory). STFT is extracting a little fuel from that memory settings (which doesn't mean the issue is fixed).

There are various causes for that (in general fuel restrictions or lack of fuel for the amount of air is entering). There are some test you must perform in order to first verify whether or not sensors are telling the truth to PCM.

Which tools do you have? Scanner, DVM, gauges, propane
The following user(s) said Thank You: Tyler

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