Hi,
I had the diagnostic code read at a local Autozone and it reported both a P00171 and P00174 error, which means all 4 O2 sensors (bank1 and 2, before and after) are bad (running too lean). Can this be a false reading? How can all 4 sensors go out at exactly the same time? Is that possible/probable?
Someone suggested replacing the fuel cap on some fords sometimes fixes the problem....any comments on that?
Another problem I have is understanding the terminology.... Looking at a diagram printout they had given me at Autozone, it shows 3 BEFORE sensors (B1S1, B2S1 and B1S2) and only 1 AFTER sensor (B1S3). I cannot see the 2 before and 2 after split/designation some online auto part stores are referring to. I don't know which replacement parts I should order, 2 before and 2 after sensors, OR, 3 before and 1 after ?!?!
Will the check light turn off automatically when the faulty sensor(s) is replaced or does it need to be electronically reset?
Any help will be much appreciated! Thanks Neil