DPF ash mass limit on VAG TDI — end-of-life DPF, particularly on urban EA189 cars.
Volkswagen P242F — DPF ash mass limit on VAG TDI — end-of-life DPF, particularly on urban EA189 cars. Typical UK independent garage cost: £750–£2200.
What actually causes P242F on a Volkswagen
EA189 post-dieselgate: increased regen frequency generated more ash, DPFs hitting P242F at 100–130k miles. EA288 cars are lasting longer. Urban-only cars log ash faster because incomplete regens leave residue.
Volkswagen engines that log P242F
- 1.6/2.0 TDI EA189 (Golf, Passat, Tiguan)
- 2.0 TDI EA288 (Golf 7, Passat B8)
- 1.9 TDI PD (older cars)
How we diagnose P242F on a Volkswagen
- VCDS block 75/76 — ash mass and regen count
- Confirm ash > 100g and regen count > 500
- Off-vehicle ultrasonic clean if cell integrity is good
- OE VAG DPF or ash-mass reset after clean (VCDS adaptation)
The common misdiagnosis to avoid
Buying a cheap Chinese replacement DPF — it won't hold ODIS calibration and will set new codes within 2000 miles. OE or genuine remanufactured only.
Volkswagen P242F repair cost in the UK
Expect £750–£2200 including parts and labour at an independent garage. Main-dealer quotes on Volkswagen are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.
Bob's workshop tip
Golf TDI EA189 — professional clean and VCDS ash reset. Often gives another 40–50k miles.
Codes usually seen alongside P242F on Volkswagen
- P2002
- P2463
- P244A
- P0401
Symptoms drivers report with P242F
- DPF warning light on the dash steady (not flashing) — often accompanied by 'Engine System Fault, Service Now'
- Reduced Engine Power warning / limp mode after another attempted regen
- Car has done multiple 'passive regens' recently (higher revs at motorway cruise, warm smell like burning) that ended incomplete
- MPG dropped 5–12 mpg over recent months as the DPF partially blocked
- Slight loss of turbo response and top-end power, engine feels 'flat'
- Exhaust smells 'hot' or 'sulphurous' after a long drive — sign of forced-regen attempts
Repairs that clear P242F
- Replace or professionally clean DPF
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P242F guide.