P0036Low urgency
O2 Sensor Heater Circuit (Bank 1 Sensor 2)
Emission · Oxygen Sensors
✅ Safe to drive. Causes delayed catalyst monitor completion and emissions test failure. Fix within 2–3 weeks.
What this means
The downstream Bank 1 oxygen sensor heater circuit has a fault. The downstream sensor monitors catalytic converter efficiency, and a slow-heating sensor delays catalyst monitoring.
Likely causes
- Failed downstream O2 sensorMost common
- Heater circuit wiring faultCommon
- Blown heater fuseLess common
Estimated repair cost
Downstream O2 sensor$80 – $250
Wiring repair$80 – $200
Fuse replacement$5 – $15
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Frequently asked questions about P0036
What does P0036 mean?
The downstream Bank 1 oxygen sensor heater circuit has a fault. The downstream sensor monitors catalytic converter efficiency, and a slow-heating sensor delays catalyst monitoring.
Is P0036 serious?
Safe to drive. Causes delayed catalyst monitor completion and emissions test failure. Fix within 2–3 weeks.
How much does it cost to fix P0036?
Repair costs for P0036 range from $80 – $250 depending on the root cause and your vehicle.
Can I drive with P0036?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.