#Rav4 #2003 #P0171 #trim #lean

Long struggle with check engine lamp: Sum up
1. P0128 -- fixed by replacing the thermostat.
2. P0420 -- A/F sensors and O2 sensors were replaced, Cat. never got ready after resetting the code. Catalytic converter cleaner didn't help. Ultimate fix was done by replacing the catalytic converter.
3. P0171 -- MAF replaced, fuel pump filter replaced, fuel injectors replaced, spark plugs replaced but never got fixed. Replacement of the bank 1 A/F sensor that was replaced in the problem 2 above fixed the high fuel trim problem. I suspect the catalytic converter cleaner damaged the sensors.
Currently, the car runs fine with very low (~-20%) fuel trim.
You can find a corresponding video for each repair. Check the playlist of Rav4.

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