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P0172 rich mixture bank one. oxygen sensor?

colindunn

colindunn

New member
would this be the oxygen sensor? thats what im thinking. or is there something else i should check first because eerything else seems fine. il clear the code and it stays off then comes back on 100 miles later or so.
 


my 2000 grand prix is doing the exact same thing but the code reader says both my o2 sensors are working fine. mine has the 3.1L motor. are you also getting an intermittent gas smell and hesitation on acceleration??
 
Your O2 sensor is the sensor sensing the problem, it shouldn't be the cause of the problem. If you do a gearchatter.com search and read the FSM page it'll show you the diagnostic aids and typical problems that cause the code.

GearChatter.com :: View topic - DTC P0172 or P0175

GC has all the FSM pages up and wide open which is why I aim you there. It gives you the description and understanding of what and why things are happening, then gives you suggestions on how to fix it.
 
ok, I just replaced the fuel pressure reg. and after a short drive the SES lamp turned off. thanks all. i was in a real bind too because we just moved and my service manual was in storage, and I am kind of new to EFI. everything I've ever owned has been 1985 or older!
 


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