Error Code P0136: What It Means & What To Do?

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The P0136 is a generic OBD-II code which would indicate the downstream O2 sensor for bank 1 has failed to meet the minimum as well as maximum voltage limits calibrated for the engine control module to see.

The P0136 fault code can be defined as an oxygen sensor circuit low voltage in bank 1, sensor 2. If refers to the second oxygen sensor in bank 1 of the car engine, which is on the side of the engine with the #1 cylinder. Generally, a voltage between 0.1 mV and 0.9 mV is produced by the oxygen sensor.

What causes this problem with the O2 Sensor Circuit Malfunction (Bank I Sensor 2)?

• The engine control module would monitor the oxygen sensors highest and lowest voltages. This code would start appearing when the voltage limits are not within specifications programmed into the engine control module
• A voltage problem may be detected by the engine control module and check engine light would start illuminating
• The other oxygen sensors are used by the engine control module to try and control the fuel injection with known values
• There can be a leakage in the exhaust or catalyst failure in front of the sensor

1. Oxygen Sensor - The P0136 code can also arise due to some issues in Oxygen Sensor. So, it is advised to replace them as soon as possible.
2. Mass Air Flow sensor - Do you remember when was the last time you got your car Mass Air Flow sensor checked up? A damaged Mass Air Flow sensor can cause a lot of issues like displaying P0136 code.
3. Manifold Absolute Pressure sensor - Manifold Absolute Pressure sensor is an important car part which should never be neglected. May be there is some fault in it due to which P0136 code may start flashing.
4. Exhaust Parts - Are your exhaust parts damaged? Don’t worry as we have solutions for all your problems.
5. Powertrain Control Module - There can be some issues with the PCM due to which you may see P0136 code appearing over and over again. Visit us to buy best quality PCM online.
6. Engine Control Module - Are you facing some faults in your Engine Control Module? Don’t worry and get them replaced or else P0136 code can turn up.
7. Fuel Pump - Common cause behind this P0136 error code can be some fault in Fuel Pump. So, it will be a good decision to replace them now.

It is essential 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 P0136 here:

Common Symptoms

• You may face an issue that the engine may run excessively rich if it goes into open loop
• The engine may start to misfire if the spark plugs get fouled out over time
• There can be an illumination in the check engine light
• You may start facing an issue of the exhaust leakage or loss of power from a clogged or bad catalyst

Learn the ways with which you can correct this trouble code:

• The O2 sensor for bank 1 sensor 2 should be replaced
• You can always repair or replace the wiring or connection to the oxygen sensor for bank 1 sensor 2
• The exhaust leaks or a damaged catalyst should be properly repaired

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• First of all, you have to scan the codes and documents freeze frame data then the codes should be cleared up to verify failure
• Make sure you monitor the oxygen sensor data 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 and the harness connections for any corrosion should be checked properly
• You should check the oxygen sensor heater circuit for the proper resistance to specifications
• The leakage in the exhaust should be checked before the sensor
• Follow the manufacturer's specific pinpoint tests for further diagnosis

Common Mistakes When Diagnosing The P0136 Code

• You can always repair the exhaust leaks before the sensor to prevent incorrect readings
• The oxygen sensor should be checked for oil or coolant contaminants from engine leaks
• The harness that is damaged should be repaired properly without taking shortcuts to prevent repeat failures.
• The removed oxygen sensor should be checked for damage from a defective catalyst and replace the catalyst if it is defective