P0136 – Meaning, Causes, Symptoms, & Fixes
Code P0136 Definition
O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)
What Does P0136 Mean?
Your car has an Engine Control Module (ECM) which monitors your O2 sensor’s highest and lowest voltages. Depending on if your detected voltage is above or below what is acceptable, you can determine whether your car’s exhaust is running rich (voltage is too high) or lean (voltage is too low).If you are seeing code P0136, it means that the O2 sensor behind your catalytic converter failed to meet its minimum and maximum voltage limit, as calibrated for you ECM to see.
- Check Engine Light
- Possible exhaust leaks
- Possible misfire
- Poor fuel mileage
*No noticeable adverse conditions in some cases
- Voltage limits not within specifications
- Faulty 02 sensor
- Exhaust leak or catalyst failure in front of sensor
- Corrosion in connecter
Code P0136 Severity – Moderate
Driving with trouble code P0136 is acceptable but only for a short period of time. Driving with this code for an elongated period of time could result in greater engine damage.
Code P0136 Common Diagnosis Mistakes
Replacing the O2 sensor without checking for any leaks or loose connections or for any voltage issues within the O2 signal circuit.
- Tools Needed to Diagnose:
Difficulty of Diagnosis and Repair – (1-4)
- A sensor is needed for this next action, and the FIXD Sensor is perfect for it. Scan codes and document freeze frame data then clear codes to verify failure.
- Check live data from all 4 terminals of O2 sensors. Make sure the specific sensor’s (Bank 1, Sensor 2) voltage is not switching back and forth from high to low rapidly when compared to other sensors.
- Visually check O2 sensor wiring and harness for corrosion
- If corrosion is present, clean the corrosion from the connector
- Check for an exhaust leak in front of the sensor
- If these checks do not clear your Check Engine Light you may need to see a mechanic so they may conduct specific pinpoint tests, and possibly replace or repair your O2 sensor (Bank 1, Sensor 2).