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Home >> Mazda >> 2003 >> Protege ES, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0140: Ho2S (Rear) Circuit - No Activity Detected >> Possible Causes

Possible Causes

Engine malfunction.
Exhaust system leak.
Low engine compression.
Open or short circuit between rear HO2S and PCM.
Rear HO2S deterioration or malfunction.

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