I got my car in april of this year with 133xxx miles and currentlyhas 138xxx. When I first got it, the cel was on for po171 code (system too lean). The guy told me it was a o2 sensor. He has told me he replaced the upper intake manifold. I then found out he never put a new pcv valve in it. Put it in, cleared the code and never came back on. This month the code came back on. I just cleared it but it still didnt come back on... any ideas?
Second, my abs light, check tire press light and trac off light comes on all the time. I had advance auto scan that and they couldnt retrieve the code. They told me it was definitely not a wheel speed sensor. I definitely thought I could find out which wheel speed sensor was bad and replace the wheelhub. How do I find out whats wrong with it? Thanks
