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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.

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