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Home >> Mazda >> 2003 >> Protege5 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0134: Ho2S (Front) Circuit - No Activity Detected >> Possible Causes

Possible Causes

Engine malfunction.
Exhaust system leak.
Front HO2S deterioration.
Front HO2S heater malfunction.
Low engine compression.
Open or short circuit between front HO2S and PCM.

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