Question

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.

Answer 1

Hi there,

This code can also be generated with a faulty front O2 sensor, low fuel pressure or an exhaust leak.

Answer 2

P0171 Toyota Code - Fuel Trim System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_toyota.html