Question about 2003 Ford Explorer Sport Trac

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2003 Ford Explorer Sport, the Check Engine Light came on

After 90,000 miles, the Check Engine Light came on. The manual says it is related to smog control system and to contact the dealer. Is the most likely problem the Oxygen sendsor? Catalytic converter? I have changed O2 sensors and catalytic converters in my Hondas and it was easy. Any good advice is greatly appreciated.

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  • hkahn1 Feb 06, 2009

    I have 83,000 miles and the check engine light can on. I took it for a smog test and it FAILED. Problem code P0171 and P0172 were revealed. I have to get a special gasket kit. The repair is going to cost over $500 and then another smog test.

    I've been a Ford fan for most of my life, but this has brought an end. No more FORD's in my life.

  • nobilerc Feb 10, 2009

    I changed both O2 sensors and the EGR valve. Then disconnected the battery to make the Check Engine light go off (reset computer). After driving a few miles the check engine light came back on. This is definitely not a Honda. My snetiments the same as hkahn1. No more Fords. Thanks for everyone's response.

  • Anonymous Mar 04, 2013

    The problem has nothing to do with a Ford or any reason to go buy something else as they will have the same technology & problems Study & learn how to diagnose ALL OBD2 Systems As Eric said, do not replace any parts or guess Use factory reference material & learn how to properly find the real issues Codes Do Not Tell You What Is Wrong Have to component test for that

  • Anonymous Mar 10, 2013

    Then you can have the same problems & you will with the next vehicle Brand has nothing to do with technology or govt regulations


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When the check engine light came on .... it generated a code in the PCM. You need to first retrieve the code, this will point you in the right direction. With out the code... do not replace any parts. The check engine light comes on for about 70 different sensors and actuators. Better not to guess. Get the code first !!

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Yes the o2 or egr valve

Posted on Jan 26, 2009

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