P0036 — HO2S Heater Control Circuit (Bank 1 Sensor 2)
Category: Powertrain Severity: Low
Updated:
DTC code P0036 means: HO2S Heater Control Circuit (Bank 1 Sensor 2). It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include burned-out downstream O2 sensor heater, blown fuse and damaged wiring under the car; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Burned-out downstream O2 sensor heater
- Blown fuse
- Damaged wiring under the car
- Wet or corroded connector
Symptoms
- Check engine light
- No drivability symptoms
- May fail an emissions test
How to diagnose it step by step
- Check the fuse.
- Measure the sensor 2 heater.
- Inspect the wiring under the car.
- Replace the sensor if needed.
How to fix it
Check the fuse and the downstream (post-catalyst) sensor connector. If the heater reads open, replace the sensor.
Estimated repair cost
Downstream sensor installed: $100–280.
Frequently asked questions
What does DTC code P0036 mean?
HO2S Heater Control Circuit (Bank 1 Sensor 2).
Is code P0036 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0036?
Yes, you can drive normally.
Related codes
P0037 P0038 P0031 P0030 P0045 P0046 P0021 P0019 P0018 P0017
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