FixVault

Home › Toyota › 2003 › Matrix Base, FWD, Standard › Repair and Diagnosis › Engine Performance › System › Engine Control System Self Diagnostics › Diagnostic Tests › DTC P0128: Thermostat Malfunction (Corolla Model) › Possible Causes

Possible Causes

Defective thermostat.
Defective cooling system.
Defective engine coolant temperature sensor.
Defective ECM.