P0140 HUMMER - O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
- 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.
When is the code detected?
The P0140 code is set when the voltage signal sent from the sensor to the Engine Control Module is constant.
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0140 HUMMER Description
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