Catalyst Heater Control Circuit/Open (Bank 1)
The drive circuit for the heated catalyst on bank 1 is open. Heated catalysts use an electrical heating element to reach light-off temperature within seconds of cold start.
Affected components
- Catalyst heater
Common causes
- High likelihood: Heater element or wiring open
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
Possible symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.