U049EInvalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Direct ozone reduction (DOR) means a catalytic coating on the radiator, sold by BASF as PremAir, that turns ground-level ozone into oxygen while air flows through the core. CARB grants an emissions credit for it and, under section (e)(14) of 1968.2, wants OBD to watch the coating on cars that claim the credit; a temperature sensor on the radiator serves this purpose. U049E applies where that sensor reports over a data link and its messages arrive but fail plausibility. A hard-wired sensor instead uses P2567 to P2570. No manufacturer documents U049E publicly. U019D marks a sensor that has gone silent. The car drives normally; the result is a MIL, a suspended ozone catalyst check and possibly a failed inspection. Check wiring and the sensor before suspecting the radiator.
- What you may notice
- Check engine light on without noticeable drivability change
- Emissions inspection failed or readiness not set
- Likely causes
- LikelyRadiator temperature sensor electronics faulty
- PossibleDamaged connector or wiring near the radiator (impact, corrosion)
- PossibleReplacement radiator or sensor not matching the original DOR version
- RareSensor or engine controller software version not matching
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.