U019D on MINI
Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
U019D on MINI vehicles indicates lost communication with direct ozone reduction catalyst temperature sensor. Au7o has documented this code across 1 MINI model — most commonly on Clubman. 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. Typical repair costs on MINI range from $1,200 to $3,700, depending on the specific model and root cause.
Common Causes of U019D
- •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
U019D on MINI by Model
MINI Clubman(1 issue)
- Radiator-Mounted EAC (Environmental Air Catalyst) Sensor LIN-Bus Failure - Radiator Replacement Required2016-2020
F54 Clubmans built with the EAC-coated radiator carry an air-quality sensor permanently mounted to the radiator core. MINI service information (SIM 13 01 19) identifies that the chemical composition of the cooling fan shroud contaminates the EAC sensor, and corrosion over time kills LIN-Bus communication with it, storing fault FC1B8302 / U019D and lighting the check engine light. Because the sensor is not separately serviceable, the fix is a complete radiator replacement, which owners have been quoted at over $3,000. An extended warranty/goodwill measure covered some vehicles up to 15 years / 150,000 miles, but coverage is region-limited and many owners report being denied.
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What does U019D mean on MINI?▼
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. On MINI specifically, this code is documented across 1 model.
What causes U019D on MINI vehicles?▼
Common causes on MINI: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U019D on a MINI?▼
Repair costs on MINI range from $1,200 to $3,700, depending on the specific model and root cause.
Which MINI models have U019D documented?▼
Au7o has documented U019D on 1 MINI model: Clubman.