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Home >> Toyota >> 2003 >> Land Cruiser >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self Diagnostics >> Diagnostic Tests >> DTC P0128: Thermostat Malfunction >> Possible Causes

Possible Causes

DTC is set when ECM detects engine coolant temperature is less than 167°F (75°C) when engine should be at normal operating temperature. Possible causes are:

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