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Home › Mazda › 2003 › MPV ES › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0116: Engine Coolant Temperature Circuit - Performance Problem › Possible Causes

Possible Causes

Engine Coolant Temperature (ECT) sensor malfunction.
Faulty connection at ECT sensor or PCM harness connectors.
PCM malfunction.