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awd4 8/30/2012
2005 Mercedes Benz C230 Kompressor 4 Cyl 1.8L - Engine
What is error code p0128?
I searched a few sites and it names the thermostat, I checked my coolant but everything seems fine.
1 Answer
  • Jimm
    Jimm 11/19/2012
    P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). P0128 indicates the engine has not achieved the optimum temperature within the specified amount of time.

    Possible Causes:

    Low coolant level
    Stuck open thermostat
    Defective engine coolant temperature (ECT) sensor
    Defective intake air temperature (IAT) sensor
    Defective cooling fan
    Defective cooling fan relay

    Possible Solutions:

    Top off coolant
    Replace thermostat
    Replace engine coolant temperature (ECT) sensor
    Replace Intake air temperature (IAT) sensor
    Replace cooling fan
    Replace cooling fan relay

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