P243DParticulate Filter Regeneration Duration (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P243D says that a regeneration of the bank 2 particulate filter took longer than the calibrated limit. CARB expects the OBD system to notice when a filter fails to regenerate properly under conditions in which it was designed to. No manufacturer publishes this bank 2 code; the bank 1 version P2458 shows what such a limit looks like, for example on VW's 2014 Touareg TDI, where an accumulated regeneration timer above 93.35 min counts as a fault. Low exhaust temperature on that bank, a weak oxidation catalyst, an incorrect temperature or pressure signal and many short trips all drag the process out. A long regeneration costs fuel and puts extra heat into the filter. P243C covers regenerations that come too often, P243E those that end with soot left in the filter.
- What you may notice
- Regeneration seems to run for a very long time (fan, idle speed)
- Higher fuel consumption
- MIL on
- Likely causes
- LikelyExhaust on bank 2 not reaching regeneration temperature (short trips, low load)
- PossibleOxidation catalyst on bank 2 converting too little fuel into heat
- PossibleTemperature or pressure sensor giving wrong values
- 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: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.