U019DLost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
Generic (OBD-II) interpretation in the TuningBot DTC database.
U · NetworkEmissionsOBD2
What U019D means
U019D
Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
Generic · emissions
Data confidence65%
The control module stopped receiving expected network messages from the Direct Ozone Reduction Catalyst Temperature Sensor node on the vehicle communication bus.
Symptoms
MIL illuminated
Possible smell of unburnt fuel or reduced performance in severe cases
Possible causes
Aged or damaged catalytic converter
Downstream oxygen sensor fault giving a wrong efficiency reading
Exhaust leak
Misfire or mixture fault overloading the catalyst
Recommended checks
Compare upstream and downstream oxygen sensor signals
Check for exhaust leaks
Check for stored misfire or mixture codes first
Verify catalyst temperature plausibility where available
Generic SAE-standard code: same meaning on every make.
19D
Specific fault index within the subsystem.
Frequently asked questions about U019D
What does U019D mean?
Lost Communication With Direct Ozone Reduction Catalyst Temperature Sensor. The control module stopped receiving expected network messages from the Direct Ozone Reduction Catalyst Temperature Sensor node on the vehicle communication bus.
Is U019D generic or manufacturer-specific?
U019D is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove U019D at file level?
Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U019D is removable in your case.
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