U019DLost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- U019D concerns a temperature sensor at a direct ozone reduction (DOR) catalyst that reports over the network rather than a plain wire; the wired versions have P2567-P2571. A DOR catalyst is a coating on the radiator or A/C condenser that turns ozone in the passing air into oxygen, such as Engelhard's PremAir, first fitted by Volvo on the S80 and by Nissan on the Sentra CA. CARB grants an NMOG credit for it only with an OBD monitor, and 13 CCR 1968.2 (e)(14) sets the malfunction criteria; under LEV III the credit reaches 5 mg/mi. No manufacturer documents U019D publicly. Without sensor data the DOR monitor cannot run, so the credit is unsupported and a MIL is to be expected. Driving is unaffected. U049E is invalid data.
- What you may notice
- MIL on without noticeable driving fault
- DOR monitor shown as not complete
- Likely causes
- LikelySensor connector at the radiator corroded or damaged by road debris
- PossibleSensor left unplugged or radiator replaced after front-end repair
- PossibleBus or supply line to the sensor broken
- RareDOR temperature sensor faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.