HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
HO2S Heater Control Circuit Low (Bank 2 Sensor 2): the control-circuit voltage is below the expected range. The heater brings the oxygen sensor to operating temperature for closed-loop fuel control.
Affected components
- Oxygen sensor heater
- Sensor wiring
Common causes
- High likelihood: Heater wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Harness chafing through insulation
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
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.