Diagnostic trouble code P0139 indicates that the powertrain control module (PCM) has detected a potential issue with the signal from the rear oxygen sensor on bank 1. The rear sensor is located behind the catalytic converter, and bank 1 refers to the side of the engine that houses the #1 cylinder.
How do I fix P0139 code?
What repairs can fix the P0139 code?
- The O2 sensor for bank 1 sensor 2 should be replaced only after all other checks of the fuel and exhaust systems test okay.
- Testing the fuel system and replacing a leaking injector.
- Replacing the catalyst in front of the sensor.
Where is Bank One and Bank two 02 sensors?
Bank 2 Sensor 1 is the first sensor closest to the engine. On Bank 2 means it is at the engine side with cylinders 2, 4, 6, 8, etc. Bank 2 Sensor 2 is the second sensor on the engine’s exhaust pipe, usually behind the catalytic converter.
How do I fix code p0137?
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How do I know if my downstream oxygen sensor is bad?
Signs a Vehicle has a Bad O2 Sensor
- Check Engine Light Comes On.
- Noticeable Loss of Fuel Efficiency.
- Sulfur or ‘Rotten Egg’ smell from Exhaust.
- Black smoke from exhaust.
- Emission levels reach high levels.
- Your engine hesitates, skips, begins bucking or has power surges.
What causes oxygen sensor slow response?
If the oxygen sensor is contaminated, the most common codes are P0139 to P0153 for oxygen sensor circuit slow response. These codes are set when the engine management system sees a lower than expected signal voltage, or the sensor is not switching from rich to lean.
What causes high O2 sensor voltage?
The high voltage condition from the O2 sensor is indicating a lack of oxygen in the exhaust or other related problems, such as a leaking fuel injector or a broken up catalyst inside.
Is there a difference between upstream and downstream O2 sensor?
The upstream sensor monitors the level of pollutants in the engine’s exhaust and sends this information to the ECU that continuously adjusts the air-fuel ratio. The downstream sensor measures the level of pollutants passing through the catalytic converter.
Are Bank 1 and Bank 2 O2 sensors the same?
How To Locate O2 Sensor. In short, the bank tells which side the O2 is on (bank 1 or bank 2), while the sensor number tells if it is before the catalytic converter (sensor 1) or after the catalytic converted (sensor 2). Remember that bank 1 is determined by the side in which cylinder number 1 is located.
What side is bank 2 sensor 1?
Bank 2 Sensor 1 (a.k.a. B2S1) is located on the side of the engine with cylinder 2 in the firing order and the O2 sensor situated in front of the catalytic converter. Depending on the car’s make and driver orientation, it could be found on either the driver or passenger side of a vehicle.
How much does it cost to fix code P0137?
Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you.
Can a bad catalytic converter cause a P0137 code?
Causes of the P0137 Code
Most issues that lead to the P0137 code have to do with the oxygen sensor at the back of the catalytic converter.