Question about 2005 Pontiac Grand Prix

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Codes: PO133 02, P1133 H 025, P1134 H 025

Hi, I have a 2005 Grand Prix w/3800 with check engine light codes of: PO133 02, P1133 H 025, & P1134 H 025. I have replaced both oxygen sensors--front & rear & made no difference. Still have codes, can you advise? Thanks!

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I would try to clean out the egr valve , check for leaks at the evap canister, check the evap canister soleniod , and lastly change out the cat convertor, The cat convertor is most likely under the federal emmission warranty of 8 yrs,.80000 miles. You can take the vehicle in to have checked by local dealer or call gm customer service to check the warranty on the cat. convertor by giving them your vehicle number.

Posted on Apr 18, 2009

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Did you clear the codes after you replaced??? Unplugging battery does NOT always work

Posted on Apr 18, 2009

  • 2009G5
    2009G5 Jan 08, 2014

    cleared codes and it came right back on

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HOW TO REPAIR A P0650


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How do i reset the computer in my 2005 pontiac grand prix


If you need to clear the codes after changing something where the check engine light had been on you will need to get with someone or a shop that has the right diagnostic tool to reset it. Unhooking the battery won't do it.

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There is a GM service bulletin on this particular item. basically covers both codes your getting.
#07-06-04-019A: Intermittent MIL/SES, DTC P2138 with Reduced Engine Power (Repair Instrument Panel (IP) to Body Harness Connector)

Models: 2005-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn)

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Did u have engine codes scanned? If not, have it done, as it may indicate the problem. Let me know. (most parts stores will scan for codes free) .

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I have a 97 pontiac grand prix with a 3800 v6 non cupercharged engine. Service engine light came on so i changed spark plugs and wires with oem parts. Now it is hesitating and running rough with service...


You need to read the codes. Get an OBD2 code scanner from your local auto parts store,, then read the code stored. Then you will have a better idea what is going on.

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