I originally had code P0420 catalyst efficiency code which only set off the check engine light during the winter months then all summer it would be fine. I read that it could possibly be the coolant temperature sensor which could cause the computer to read the CC emissions when the engine wasn't warm. I replaced both bank 1 O2 sensors and the coolant temperature sensor then reset the codes. Then I started getting P0171 bank 1 is running too lean code. I checked for vacuum leaks (there weren't any) and cleaned the MAF sensor which then turned the light off. Now I'm trying to get it to pass inspection and after driving it for 200 miles (after reseting codes) the drive cycle still hasn't tripped the catalyst sensor or evaporative system. Any idea on what the cycle for those sensors is for my year, make, and model? Could this be a result of a lose connection?
have the same problem?
Monday, January 11th, 2010 AT 11:41 AM