Question:

Troubleshooting code P0128

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  1. verify proper engin coolant temperature sensor operation


  2. A code P0128 may mean that one or more of the following has happened:

    Low engine coolant level
    Leaking or stuck open thermostat
    Faulty cooling fan (running too much)
    Faulty coolant temperature (ECT) sensor
    Faulty intake air temperature (IAT) sensor

    Verify coolant strength & level
    Verify proper cooling fan operation (check if it's running more than it should).
    Verify proper engine coolant temperature (ECT) sensor operation,
    Verify proper intake air temperature (IAT) sensor operation,
    If the above items check out good, replace the thermostat
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