P0036: O2 sensor heater control circuit (Bank 1 Sensor 2)
You can keep driving. Get it checked when convenient.
Can I drive with P0036?
Yes, you can keep driving. Downstream sensor heater failure; usually safe to drive for a short time, but get it checked to keep driving.
What does P0036 mean?
P0036 stands for HO2S Heater Control Circuit (Bank 1, Sensor 2).
Symptoms you may notice
- Check engine light on with no noticeable change in how the car drives
- Vehicle fails state emissions smog test
- Normal engine power and shifting
How much does it cost to fix?
Repair costs for code P0036 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Failed heater element in downstream O2 sensor
- Damaged underbody wiring harness
- Blown O2 heater fuse
- Corrosion in rear connector
What to do next
- Check underhood fuse box for blown heater fuses.
- Check the wiring pigtail under the vehicle.
- Replace the downstream oxygen sensor.
Last updated: October 2026
Related codes
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P0036 affects the heating element of the rear oxygen sensor after the catalytic converter. Because this sensor only checks emissions efficiency, you can drive without worry.