HelpForCars.net- All Aobut Automotive Repairs
HelpForCars.net- All Aobut Automotive Repairs

P0140 - 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
What does this mean? What does this mean?
Tech notes
Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.
What does this mean? What does this mean?
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.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0140 Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

P0140 Information for specific makes
P0140 AUDI HO2S12 Sensor Circuit No Activity Detected
P0140 BMW O2 Sensor Circuit Low Voltage Bank 1 Sensor 2
P0140 BUICK O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 CADILLAC O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 CHEVROLET O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 CHRYSLER O2 Sensor 1/2 Circuit Low
P0140 DODGE O2 Sensor 1/2 Circuit Low
P0140 GMC O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 HUMMER O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 HYUNDAI HO2S Circuit No Activity Detected Bank 1 Sensor 2
P0140 INFINITI O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 ISUZU HO2S Circuit High Voltage Sensor 2
P0140 JAGUAR O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 JEEP O2 Sensor 1/2 Circuit Low
P0140 KIA HO2S12 Circuit No Activity Detected
P0140 MAZDA HO2S Rear Circuit No Activity Detected
P0140 MERCEDES-BENZ O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 MINI O2 Sensor Circuit Low Voltage Bank 1 Sensor 2
P0140 MITSUBISHI Cylinder 1-4 Heated Oxygen Rear Sensor No Activity Detected
P0140 NISSAN O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 OLDSMOBILE O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 PONTIAC O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 SATURN O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2
P0140 SUBARU HO2S12 No Activity Detected
P0140 VOLKSWAGEN HO2S12 Sensor Circuit No Activity Detected
Need A Repair Shop?
Find local automotive repair shops in your area.
Home - Privacy Policy - Terms and Conditions - Copyright 2010-2016 Helpforcars.net
AutoCodes.com - HelpForCars.net - Infinitihelp.com - Nissanhelp.com