P0030 - HO2S Heater Control Circuit (Bank 1 Sensor 1)

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

Code first. Confirm symptoms and checks before pricing parts.

Explore Related Systems

Compare nearby repair families.

Common Next Steps

Turn the code into the next check.

Related Inspection

Code Overview

The heater circuit for the upstream 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 O2 sensor connector and wiring
2. Check heater fuse
3. Verify heater circuit power and ground
4. Check for exhaust heat damage to wiring

Likely Repairs & Cost Guides

Confirm the repair path before pricing parts.

Related OBD Codes

Browse nearby codes when systems overlap.

Next Steps

Move from code to checks, then estimate.