OBD-II code · Powertrain (generic, extended)
P2570 Direct Ozone Reduction Catalyst Temperature Sensor Circuit High
The DOR catalyst temperature sensor reads stuck high — short to reference voltage or open signal return. Without a valid temperature the ECM cannot enable the DOR efficiency monitor.
Is it safe to drive with P2570?
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 reference voltage
- PossibleOpen signal return
- Less likelyConnector pins corroded - high contact resistance
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 Temperature Sensor, Sensor Wiring
Related codes
- P2569Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low
- P256DEngine Idle Speed Selector Sensor/Switch Circuit High
- P256EEngine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic
- P256FA/C Request B Circuit Range/Performance
- P2571Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic
- P2572Direct Ozone Reduction Catalyst Deterioration Sensor Circuit
- P2573Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.