Why does my 2002 blazer read code 140

Asked by jeff Feb 28, 2017 at 05:10 PM about the 2002 Chevrolet Blazer LT 4-Door 4WD

Question type: Maintenance & Repair

2 Answers
35,325

lrodri911 answered 7 years ago

It means that the O2 sensor for Bank 1, Sensor 2 failed respond. Bad sensor or bad wires

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223,885

Rowefast answered 7 years ago

P0140 CHEVROLET - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2...Possible causes; Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection, Inappropriate fuel pressure, Faulty fuel injectors, Intake air leaks may be faulty, Exhaust gas leaks,,,Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

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