| PCode | Code | Brand | Description |
|---|---|---|---|
| P4D16 | P4D16 | SCR system, efficiency | |
| P42FC | P42FC | SCR exhaust emission system, efficiency | |
| P4D18 | P4D18 | SCR system, efficiency | |
| P20EE | P20EE | DeNox system to protect against air pollution (ineffective) | |
| P2BAD | P2BAD | DeNox Air Pollution Protection System (Functional Failure) |