Question about 1996 GMC Yukon

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Service Engine Light

OBDII codes PO172 and PO175 fuel trim bank 1 and 2 respectfully. Thoughts on what is causing these??

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Have u checked/ replaced your o2 sensors since you have owned the vehicle?

Posted on Dec 16, 2008

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HAVE A 1996 YUKON THE SERVICE ENGINE LIGHT WANT GO OUT PLUS THE ABS LIGHT WANT GO THEY WANT PASS IT ON INSPECTION WHAT DO I NEED TO FIX THEM , THE ABS MY BRAKE RESAVORE IS LEAKING CAN THAT BE THE PROBLUM THANK YOU

Posted on Sep 03, 2009

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    I have a 1997 1500 with a 5.0 Im getting codes po143 po172 po175 and po300. Im not sure what the cause could be.


    Code 300 is for a random miss.
    172 and 175 are for the same problem - 172 is for a rich fuel mixture bank one and 175 is for the fuel mixture too rich on bank two.
    Code 143 is for a rich mixture for sensor number 3.
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    Feb 22, 2013 | Cars & Trucks

    1 Answer

    Po172


    P0172 CHEVROLET - Fuel Trim System Rich Bank 1

    Possible causes- Faulty front heated oxygen sensor

    - Ignition misfiring
    - Faulty fuel injectors

    - Exhaust gas leaks

    - Incorrect fuel pressure

    - Faulty Mass Air Flow (MAF) sensor

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    2002 6 cylinder 3.o engine Ford Ranger. Cold start problem. Bank 1 code PO172 and Bank 2 code PO175. System to rich. Where to start checking.


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    Check Engine light is on my 1997 F150 with a small V-8. The tester returns codes P0171, P0172, P0174 and P0175. What does all this mean?


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