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Home >> Jaguar >> 2000 >> XJ8 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P0128: Coolant Thermostat Range/Performance Malfunction >> Possible Causes

Possible Causes

Contaminated coolant.
Engine coolant thermostat failure.
ECT sensor failure (ECT DTCs are also set).

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