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Home › Mazda › 2003 › Protege5 Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0118: Engine Coolant Temperature Sensor Circuit - High Input › Possible Causes

Possible Causes

ECT sensor malfunction.
Open or short circuit between ECT sensor and PCM.
PCM malfunction.
Poor connection at ECT sensor or PCM harness connectors.