Last post on Nov 19, 2012 at 8:45 AM
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#116 of 117 Re: Cavalier Diagnostics [smonday]
Nov 19, 2012 (6:48 am)
I don't think the P0171 code means that the downstream O2 sensor is bad. Just that it's detecting an excess of oxygen on the exhaust flow. Which could be caused by a bad MAF sensor.
All the rest of the codes could be a result of the excess oxygen in the exhaust.
#117 of 117 Re: Cavalier Diagnostics [srs_49]
by Mr_Shiftright HOST
Nov 19, 2012 (8:45 am)
yep P0171 is tricky. Many a good 02 sensor has been replaced because of that code.
MAF sensor is a good guess; also coolant temp. sensor can throw this code; perhaps even a vacuum or exhaust leak.