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ECT Sensor Location

sadjam357sadjam357 Member Posts: 1
edited January 2018 in Mercury
I have an 2008 Grand Marqui LS 4.6L flex fuel vehicle
Engine code P0128 was diagnosed.
I am trying to find a clear diagrahm or picture. Of where the sensor is located on the motor.
Thank you.


  • thecardoc3thecardoc3 Member Posts: 5,701
    P0128 means that the engine coolant temperature is either not getting hot enough quick enough, or possibly never reaches full operating temperature. This is far more likely to be a thermostat issue (stuck open) than a sensor issue.
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