Re: P0171 Code on a 2001 2.3. PCV valve? O2s? Help!
I have a similar situation. P0171 code and it idles normally. As long as I keep RPM above 2500 or so it seems to run normally. It stumbles if below with any load. The vac. hose looks good, though. How do I check upstream O2 sensor? I can't find an upstream O2 Sensor, just the one on top of the Cat. I see that AutoZone lists one, though. Any help would be greatly appreciated. Alan
Last edited by SKSAlan; 05-17-2014 at 13:06.
Reason: More questions