OBD-II code · Network
U019D Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
ECU lost communication with the direct ozone reduction (DOR) catalyst temperature sensor. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
Is it safe to drive with U019D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor unpowered or wiring broken
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Dor Catalyst Temp Sensor, Can Bus
Related codes
- U019ALost Communication With Tachograph Module
- U019BLost Communication With Battery Charger Control Module A
- U019CLost Communication With Glow Plug Control Module 2
- U019ELost Communication With Transmission Range Control Module
- U019FLost Communication With Engine Coolant Pump Control Module
- U01A0Lost Communication With Hybrid/EV Battery Interface Control Module A
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.