P214CSCR NOx Catalyst Outlet Temperature Too High
- 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
- P214C looks at the downstream end of the SCR catalyst: the temperature measured behind it rose above the permitted maximum outside regeneration. California's OBD rule lists SCR intake and outlet temperature as separate data values a diesel must report, so both points are watched on their own. An outlet reading that climbs above the inlet value hints at heat produced inside or just ahead of the brick, for instance hydrocarbons burning on the SCR or soot glowing in a combined filter-SCR unit, but a faulty outlet sensor is just as likely. The material limit is the same as on the inlet side, which 40 CFR 1036.115 and Navistar's patent US20190232224 describe for vanadium catalysts. No manufacturer documents P214C publicly. P214A is the inlet counterpart, P214D the outlet fault during regeneration.
- What you may notice
- Check engine light on
- Reduced engine power
- Implausible outlet temperature compared with the inlet value in live data
- Likely causes
- LikelySCR outlet temperature sensor faulty or reading too high
- PossibleHydrocarbons passing the oxidation catalyst and burning on the SCR
- PossibleFuel or oil entering the exhaust from the engine or turbocharger
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.