OBD-II code · Powertrain (generic, extended)
P242F Particulate Filter Restriction Ash Accumulation Bank 1
The diesel particulate filter on bank 1 reports backpressure attributable to ash (non-combustible residue from oil and fuel additives, not removable by regeneration). The filter has reached the end of its service life and needs cleaning or replacement.
Is it safe to drive with P242F?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyDPF full of ash
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–8 h
- Emissions test
- Likely to fail
- Parts involved
- Dpf B1
Related codes
- P243AParticulate Filter Restriction Ash Accumulation Bank 2
- P242CExhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3
- P242DExhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 3
- P242EExhaust Gas Temperature Sensor Circuit Intermittent or Erratic Bank 1 Sensor 3
- P2430AIR System Air Flow or Pressure Sensor Circuit Bank 1
- P2431Secondary Air Injection System Air Flow/Pressure Sensor Circuit
- P2432Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.