P0036 - HO2S Heater Control Circuit (Bank 1 Sensor 2)

The heater circuit for the downstream oxygen sensor on bank 1 is not operating correctly.

Code Overview

The heater circuit for the downstream oxygen sensor on bank 1 is not operating correctly.

Common Causes

• Faulty oxygen sensor heater
• Open or shorted wiring
• Blown fuse
• Connector damage

Diagnostic Steps

1. Inspect downstream O2 sensor wiring
2. Check heater fuse
3. Verify heater circuit power and ground
4. Inspect for exhaust-related wire damage

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.