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Mazda
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2007
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3 Mazdaspeed, 2.3 M
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Repair and Diagnosis
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Engine Performance
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Engine Control Systems
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Engine Control System (L3 With TC)
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Heated Oxygen Sensor (Ho2S) Inspection
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Rear HO2S Circuit Open/Short Inspection
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Short circuit
Short circuit
If there is continuity, there is a short circuit. Repair or replace the wiring harness.
Rear HO2S terminal A and body ground
Rear HO2S terminal A and power supply
Rear HO2S terminal B and power supply