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Home >> Mazda >> 2003 >> MX-5 Miata Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0138: Rear Heated Oxygen Sensor Circuit High Input >> Detection Condition

Detection Condition

DTC is set when rear HO2S voltage is more than .45 volt for 6 seconds when vehicle is decelerating (fuel cut). PCM determines that circuit input is high.

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