Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High
The DOR deterioration sensor signal voltage reads above the upper limit — short to reference voltage or open signal return.
Affected components
- Dor deterioration sensor
- Sensor wiring
Common causes
- High likelihood: Signal wire shorted to reference voltage
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Supply wire pinched against B+ source
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.