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Home › Mazda › 2003 › MPV ES › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0140 Or DTC P0160 › Possible Causes

Possible Causes

Engine compression low.
Engine Malfunction.
Exhaust system Leak.
Open or short between rear HO2S and PCM harness connectors.
Rear HO2S deterioration.
Rear HO2S heater malfunction.