Therm. is being held open causing the engine to not heat up to a full 190 degrees. make sure you put in a 190 degree therm. and unhook the negative battery cable for at least 5 minutes to clear the code. the system could need a flush too, with over 100,000 miles or 5 years
Testimonial: "The Tstat I used is an OEM part from the dealer. system flushed when Tstat was changed. I replace 2 relays and the Intake air Temp sensor cleared the code. Drove about 300 miles and the CEL came on with Code P0128 again. Anyone have this experience and a solution. Thanks"
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The coolant system was flushed when the Tstat was changed
I have now changed the relays and the Intake air temp sensor cleared the code. I went about 300 miles and the CEL came on with the same Code P0128. No Idea how to fix this problem at this point.
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