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.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light or DPF warning light on
- Power loss / limp mode
- Increased fuel consumption
- Failed forced regeneration attempts
Common causes
Ordered by how often each turns out to be the cause.
- DPF full of ashCommon
Parts involved
- DPF B1
P242F is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.