P2BAENOx Exceedence - NOx Control Monitoring System
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2BAE is tied to the system that watches NOx control itself, typically the NOx sensors and the logic that compares measured emissions with the permitted level. Regulation (EU) 2017/1151 Annex XVI allows exhaust NOx sensors to replace separate quality and consumption checks, with warning and inducement once the NOx OBD limit is passed; the heavy-duty rules keep counters for monitoring system faults. Deutz stores P2BAE-00 on its EMR L1 controllers under SPN 4090, FMI 15, as a high NOx warning from the SCR efficiency monitor. Jaguar Land Rover bulletins list P2BAE among the DEF inducement codes, mostly next to P2BAF and a root code such as P2BA9 or P249C; it clears once that cause is fixed. The driver sees the MIL and a DEF message.
- What you may notice
- MIL with DEF dosing malfunction message
- No-restart countdown in the cluster
- Stored together with P2BAF and a root cause code
- Likely causes
- LikelyUnderlying SCR fault such as poor DEF quality or dosing pressure deviation
- PossibleNOx sensor damaged, badly mounted or contaminated
- PossibleAir trapped in the DEF system
- RareOutdated engine software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €0 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.