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2005 Ford Explorer Question: Why is the "check engine soon" light on?

 

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nwhite419, 4.0L V6, Woburn, MA, January 27, 2012, 12:51
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I had the code read and it says it has something to do with the engine not reaching the proper temp. Any idea why this is happening?

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  • Answer #1

    January 27, 2012, 16:52
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     Journeyman

    Possibly a bad coolant temp sensor? Does the car overheat?

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  • Answer #2

    January 28, 2012, 17:35
     Journeyman

    Bad thermostat.

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  • Answer #3

    baccurate from Accurate Automotive & Tire Warehouse, February 03, 2012, 14:51
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     Technician

    I think it should be a P0128 (Low Coolant temperature). If it takes the vehicle too long to achieve operating temperature, this code can set. Usually the thermostat is stuck partially opened. I recommend replacing it with a factory thermostat.
    I have also had oxygen sensors cause this problem as well, will need equipment to test them.
    Good luck

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