Question about 1998 Chevrolet Cavalier

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Code P0172 - 03 2.2 Cavalier

I have had this code for the last few months now; cannot seem to fix it!

I have replaced:

MAP Sensor
Coolant Sensor
02 Sensor
IAC Valve

What is next on the list i might have missed?


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  • Jose Palacios Jan 27, 2009

    I will try the FPR 1st and then post my success or failure..

    Thanks aaangle220

  • Jose Palacios Feb 07, 2009

    I have replaced the FPR and I still have this problem:

    On cold starts my rpms drop down to about 200 and then right back up to 1000 rpms; this will continue until the engine warms up...

    I'm running of ideas...

    Please help...


  • Jose Palacios Jan 13, 2010

    I finally figured out the problem!

    My bloody Fuel filter was partly clogged thus restricting the flow of fuel to the engine

    Since I've changed the filter my engine idles perfectly no more Rich condition!

    After a year of trouble, this was the only I hadn't yet changed! I will be sure to change the fuel filter every 2 years now



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ASE Mechanic:
well a P0172 is a rich condition. meaning too much fuel entering the exhaust. a bad wire, plug, stuck open fuel injector, and or a bad fuel pressure regulator could be the problems. Just have to start testing each one.

Posted on Jan 27, 2009

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This from another board, spelling mistakes included:


Replied on January 15, 2010
Problem FIXED!

I read in a troubleshooting tree that you can reset the fuel trims, I just diconnected the battery for a few mins and the problem is cured the light has not come back on for several weeks now. The code scanner just erased the codes but did not reset anything. With the old fuel pump not pumping enough fuel the fuel trims had adusted to compesate for a weak pump, When I put in the new pump the injectors were trying to undercompensate which was sending the the code PO172 system to rich.

Posted on Sep 29, 2011


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