Intake Air O2 Sensor Heater Control Circuit/Open Bank 1
The control circuit for the intake air O2 sensor heater on bank 1 is open. Sensor cannot reach operating temperature.
Affected components
- Intake air o2 sensor b1
- Intake air o2 sensor heater b1
- Wiring harness
- Ecm
Common causes
- High likelihood: Open in heater control wire
- Medium likelihood: Open heater element
- Low likelihood: Pin pushed back out of connector body
Possible symptoms
- Check engine light on after several drive cycles
- Slightly increased fuel consumption during cold start
- Delayed entry into closed-loop fuel control
- Failed emissions inspection (lambda readiness)
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.