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2002 Toyota Corolla CE with engine code P0171. The code turns off if it is cold air outside or raining. When it warms up again the code turns back on. I have changed the MAF and checked all the hoses and vac hoses for leaks but found none.

Vehicle: 2002 Toyota Corolla CE

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Best answer
Hi there,

This code can also be generated with a faulty front O2 sensor, low fuel pressure or an exhaust leak.
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P0171 Toyota Code - Fuel Trim System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_toyota.html

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