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P0139 Code – O2 Sensor Circuit Slow Response Bank 1 Sensor 2

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Code P0139 Possible Causes
Intake air leaks may be faulty
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Engine vacuum leaks
Exhaust gas leaks
Faulty fuel injectors
Faulty Heated Oxygen Bank 1 Sensor 2
Fuel contamination

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