U019D on 2016-2020 MINI Clubman (Cooper S Clubman, Cooper Clubman, Cooper S ALL4) — Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
1 vehicles · 1 makes · $1,200-$3,700 repair
Most Reported On
U019D is an OBD-II diagnostic trouble code meaning “Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor.” A control module on the LIN or CAN bus stopped receiving valid messages from the direct ozone reduction (DOR) catalyst temperature sensor. On BMW and MINI this sensor is the radiator-mounted Environmental Air Catalyst (EAC / PremAir) coating sensor, which reports the temperature of the ozone-reducing catalyst layer applied to the radiator core. The module sets the code when the expected periodic sensor message is absent, corrupt, or fails the bus timeout threshold, so the DOR catalyst function can no longer be monitored. This code is most commonly reported on 2016-2020 MINI Clubman (Cooper S Clubman, Cooper Clubman, Cooper S ALL4), with repair costs ranging from $1,200 to $3,700.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U019D.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does U019D mean?
U019D stands for "Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor." A control module on the LIN or CAN bus stopped receiving valid messages from the direct ozone reduction (DOR) catalyst temperature sensor. On BMW and MINI this sensor is the radiator-mounted Environmental Air Catalyst (EAC / PremAir) coating sensor, which reports the temperature of the ozone-reducing catalyst layer applied to the radiator core. The module sets the code when the expected periodic sensor message is absent, corrupt, or fails the bus timeout threshold, so the DOR catalyst function can no longer be monitored.
What are the most common causes of U019D?
The most common causes of U019D are: Failed radiator-mounted EAC / direct ozone reduction catalyst temperature sensor, Open, shorted, or corroded LIN-bus signal wire between the sensor and the controlling module (front-end position exposes it to road salt and water), Corroded or water-intruded sensor connector at the radiator, Loss of supply voltage or ground to the sensor, Radiator replaced without transferring or reconnecting the EAC sensor. The specific cause varies by vehicle.
How much does it cost to fix U019D?
Repair costs for U019D range from $1,200 to $3,700, depending on the vehicle and root cause.
Which vehicles are affected by U019D?
Au7o has documented U019D across 1 vehicle models from 1 manufacturers: MINI.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.