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Hi, I have this p1028 code, looked it up, changed the thermostat and code still there, I noticed my temp gauge sensor stays on ther low position for a long time, it goes up a little after driving the car for about 40 mins, the car's temp reads about 75-90° on the "hidden menu" computer. (Chicago winter) but the gauge won't go up sometimes. Can it be ther coolant temp sensor since I just replaced the thermostat thinking that would fix the problem?
Any help welcome thanks, and if it's the senator where is it located?

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I would take infrared thermometer and measure the actual temperature. If it says 75 but actual is 130 - your temp sensor is bad. If not - then...thermostat locked open?
 
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