Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Intermittent/Erratic
The DOR deterioration sensor signal jumps or drops out — typically loose connectors or chafed wiring near the radiator.
Affected components
- Dor deterioration sensor
- Sensor wiring
Common causes
- High likelihood: Loose connector
- Low likelihood: Connector with intermittent contact under vibration
- Low likelihood: Harness routed against vibrating component
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.