iv been having trubble figuring out what is wrong with my car for half a year when the check engine came on it was a month or two after i got my new cat converter. altho it has nothing to do with the cat. The code show that o2 sensor 1 is defect or has encounter a problem somewhere were it not getting the right signal. when the code first came on i replace both o2 sensor and nothing.
i have an 02 cavalier with 2.2 ecotec, custom intake, tusdo header, magnaflow cat and exhaust. everything stock and spark plugs are new. i look at the sematic (wire diagram) it show to have a fuse for the sensor and i cant find it. hope fully i dont have a short or open in the wire. has anyone encounter this problem. (po171 and po141 are similar) (not the same with 2.2 ohv)

Join the club, as my '99 'Noma just threw a P1870. I know it's trans related but how?

Go beyond the "bolt-on".

po171 is a lean system and po141 is the heater performance bank 1 sensor 2.

245hpcavy wrote:po171 is a lean system and po141 is the heater performance bank 1 sensor 2.

This is true. The P0141 could be a bad connection, or bad sensor. Also there is no fuse for the O2 sensor's.



FU Tuning