Heated Catalyst Temperature Below Threshold (Bank 1)
The heated catalyst on bank 1 does not reach its target temperature within the expected time. Common causes are a defective heater element, supply fault, or a damaged temperature sensor.
Affected components
- Heated catalyst
- Catalyst heater
- Cat temperature sensor
Common causes
- High likelihood: Heater element open or shorted
- Medium likelihood: Catalyst temperature sensor failed
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
- 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.