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Home >> Mazda >> 2000 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1135: Front O2 Sensor Heater Circuit Low >> Condition

DTC P1135: Front O2 Sensor Heater Circuit Low: Condition

PCM supplies ground to heater to complete circuit. DTC is set if PCM detects voltage less than 5.8 volts when no ground is supplied to heater. Possible causes are:

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