OBD-II code · Powertrain (generic, extended)
P2574 Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low
The DOR deterioration sensor signal voltage reads below the lower limit — short to ground or internal short.
Is it safe to drive with P2574?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Dor Deterioration Sensor, Sensor Wiring
Related codes
- P2572Direct Ozone Reduction Catalyst Deterioration Sensor Circuit
- P2571Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic
- P2573Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
- P2575Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High
- P2576Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Intermittent/Erratic
- P2577Direct Ozone Reduction Catalyst Efficiency Below Threshold
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.