P0137 - OBD Trouble Code

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The P0137 is a trouble code which would indicate that the O2 sensor for bank 1 sensor 2 is failing to increase the voltage output above .21 volts and would thus indicate excessive oxygen in the exhaust.

This code would start occurring when the engine control module sees the voltage of the O2 sensor for bank 1 sensor 2 below .21 volts when the engine control module has commanded the fuel to a targeted rich condition on the bank of the engine.

This fault code is related with the second oxygen sensor installed on a car, generally after the catalytic converter to test the oxygen level after the exhaust gases have moved through the converted. When the voltage level of the sensor stays below the standard level for longer than 120 minutes, then it would send a trigger signal which the computer of the car would later interpret as a potential repair issue.

What causes this problem with the 02 Sensor Circuit Low Voltage (Bank I Sensor 2)?

• The low voltage problem may be detected by the engine control module and the check engine light should be turned on
• The engine control module uses other oxygen sensors to try and control the fuel injection with their values
• There can be an issue of exhaust leakage

1. Oxygen Sensor - Oxygen Sensor is an important car part which should never be neglected. May be there is some fault in it due to which P0137 code may start flashing.
2. Mass Air Flow sensor - Is your Mass Air Flow sensor damaged or broken? Don’t worry as we have solutions for all your problems.
3. Manifold Absolute Pressure sensor - Defective car Manifold Absolute Pressure sensor can be a major reason why P0137 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
4. Exhaust Parts - Everything is okay with the oxygen sensor and still OBD code P0137 triggering? Then there must be some defects in Exhaust Parts. Replace them as soon as possible.
5. Powertrain Control Module - P0137 code flashing? Get your Powertrain Control Module inspected from a mechanic.
6. Engine Control Module - Engine Control Module is an essential car part. Take care of it and you can rely on us to purchase best quality Engine Control Module online.
7. Fuel Pump - There can be some defects in the Fuel Pump due to which P0137 code may come on again and again. Make sure to replace it or else you may have to face some major issues.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0137 here:

Common Symptoms

• The engine may start running rich during the testing of the sensor for problems
• There can be an illumination in the check engine light
• You may have exhaust leaks before or near the oxygen sensor in question

Have a look at some ways with which you can correct the P0137 code:

• Make sure that you replace the O2 sensor for bank 1 sensor 2
• You can always repair or replace the wiring or connection to the O2 sensor for bank 1 sensor 2
• The exhaust leaks before the sensor should be replaced

However, if you face any issue then we have stocked a wide range of best priced catalytic converter, fuel pump, relay wiring harness and more to help you out in fixing your car.

• The codes should be scanned and document freeze frame data then clear the codes to verify failure
• The oxygen sensor data should be monitored to see if the voltage is switching back and forth between low and high at a fast rate compared to other sensors
• The oxygen sensor wiring should be checked and the harness connections for any corrosion in the connections
• You can always check the oxygen sensor for any physical damage or fluid contamination
• The exhaust leaks should be checked before the sensor
• You must carefully follow the manufacturer's specific pinpoint tests for carrying out further diagnosis

Common Mistakes When Diagnosing The P0137 Code

If you want to prevent misdiagnoses, then you must follow these simple mentioned below:

• Make sure that you repair the exhaust leaks before the sensor to prevent excess oxygen getting into the exhaust stream causing the low voltage readings
• The oxygen sensor for oil or coolant contaminants that could foul the sensor should be checked properly
• The harness that is damaged should be repaired properly to prevent erratic readings from the sensors
• You must check the removed oxygen sensor for damage from a broken catalyst and the catalyst should be replaced if it has come apart