P243BParticulate Filter Restriction - Forced Limited Power (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P243B means the second particulate filter is so restricted that the engine controller cuts power to protect engine and filter. Ford documents the code in its 2024–2025 OBD summary for gasoline engines, as part of the petrol particulate filter monitor next to P246C for bank 1. Once the filter has been above 250 °C for 30 s and exhaust flow lies between 400 and 850 m³/h, a normalised back pressure above 1.0 for 5 s sets the fault. That makes it one of the few bank 2 filter codes with public thresholds, and it shows the code is not limited to diesels. Likely causes are a filter overloaded with soot or ash, a dented pipe, or a pressure sensor or hose reading too high. Until the restriction is cleared the engine stays in reduced power. A high soot load on this bank without the power limit is P243F.
- What you may notice
- Noticeably reduced engine power
- MIL on
- Poor acceleration at higher speed
- Likely causes
- LikelyBank 2 filter overloaded with soot or ash
- PossibleDamaged or blocked exhaust pipe on bank 2
- PossiblePressure sensor or hose on bank 2 reporting too high a pressure
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.