Trouble codes › P0136
P0136 O2 Sensor Circuit (Bank 1 Sensor 2)
Oxygen sensors
P0136 means the engine computer isn't getting a sensible signal from bank 1's rear oxygen sensor (after the catalytic converter).
The engine computer isn't getting a sensible signal from the rear oxygen sensor on bank 1 (after the catalytic converter), which it uses to check the converter.
Safe to drive for now. It mostly affects the catalytic converter check and emissions readiness.
Common causes
- A failed rear oxygen sensor
- Damaged wiring or a corroded connector (rear sensors get road splash)
- An exhaust leak near the sensor
Symptoms
- Check-engine light
- Emissions monitors may not be ready
Common on: Toyota Corolla
What to check first
- Inspect the wiring and connector under the car.
- Check for exhaust leaks near the sensor.
- Watch the rear sensor with a scan tool; on a warm engine it usually sits fairly steady between about 0.5 and 0.8 volts.
- Replace the sensor if it's dead or erratic.
What does P0136 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0136No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0136 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.