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Home >> Mazda >> 2002 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0134: Front Heated Oxygen Sensor Circuit No Activity Detected >> Possible Cause

Possible Cause

Front HO2S deterioration.
Front HO2S heater malfunction.
Leakage exhaust system.
Open or short circuit between PCM.
Low engine compression.
Engine malfunction.

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