I know theis is a toyota forum, but I need your opnion on my wife's 01 Nissan pathfinder.
I just replaced the upstream O2 sensor on my wife's 01 pathfinder. after a week of driving, the SES light came on again with the same code. P0171. I reset it and the light came on again and I brought it to the mechanic.
They said it's the MAF sensor. and the code was P0170. is it possible for the MAF sensor to trigger a P0171 and a P0170?
and if the MAF sensor is really bad, what are the long term effects if I don't replace it?
thanks.