OBD-II code · Powertrain (generic, extended)
P2571 Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic
The DOR catalyst temperature sensor signal jumps or drops out — typically loose connectors or chafed wiring near the radiator pack.
Is it safe to drive with P2571?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLoose connector
- PossibleChafed harness
- Less likelyConnector with intermittent contact under vibration
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
- 0.3–1 h
- Emissions test
- Likely to fail
- Parts involved
- Dor Temperature Sensor, Sensor Wiring
Related codes
- P2569Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low
- P256EEngine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic
- P256FA/C Request B Circuit Range/Performance
- P2570Direct Ozone Reduction Catalyst Temperature Sensor Circuit High
- P2572Direct Ozone Reduction Catalyst Deterioration Sensor Circuit
- P2573Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
- P2574Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.