P242F on Volkswagen
Diesel Particulate Filter Restriction - Ash Accumulation (Bank 1)
P242F on Volkswagen vehicles indicates diesel particulate filter restriction - ash accumulation (bank 1). Au7o has documented this code across 3 Volkswagen models — most commonly on Caddy, Scirocco, Touran. P242F is a generic diesel emissions code indicating the engine control module has detected excessive restriction in the Diesel Particulate Filter (DPF) caused by ash accumulation rather than recoverable soot. Unlike soot, ash cannot be burned off through normal or forced regeneration, so this typically signals the DPF is reaching the end of its service life and needs cleaning or replacement. The condition reduces exhaust flow and can trigger reduced-power (limp) mode if left unaddressed. Typical repair costs on Volkswagen range from $250 to $1,500, depending on the specific model and root cause.
Common Causes of P242F
- •DPF at end of service life with accumulated non-combustible ash from engine oil additives
- •Excessive oil consumption (worn rings/valve seals) loading the filter with ash
- •Use of non-low-ash (non-CJ-4/low-SAPS) engine oil
- •Repeated incomplete or failed regeneration cycles over time
- •Faulty DPF differential pressure sensor giving high restriction readings
- •Clogged or saturated DPF substrate requiring professional cleaning or replacement
P242F on Volkswagen by Model
Volkswagen Caddy(1 issue)
- DPF blockage from short-journey/urban use2007-2020
Caddy diesels used mainly for short urban trips cannot complete diesel particulate filter (DPF) regeneration, because the exhaust never gets hot enough for long enough. Soot accumulates, active regen attempts fail mid-cycle, and the DPF eventually clogs — triggering the DPF warning light, limp mode and (over time) oil dilution from post-injection fuel. This affects all DPF-equipped Caddy TDIs and is a frequent complaint from tradespeople doing stop-start delivery work.
Volkswagen Scirocco(1 issue)
- 2.0 TDI diesel particulate filter (DPF) and EGR clogging2008-2017
The 2.0 TDI's diesel particulate filter blocks up on cars used mainly for short, low-speed urban journeys, because the engine never reaches the sustained temperatures needed for passive/active regeneration. A clogged DPF (often combined with a sooty or sticking EGR valve) triggers the exhaust/glow-plug warning lamp, reduced power, limp mode, heavy smoke and more frequent forced regenerations. Reports note this worsened on some cars after the dieselgate NOx emissions software update, which increased regeneration frequency, rough idle and DPF warnings.
Volkswagen Touran(1 issue)
- Diesel Particulate Filter (DPF) Clogging on TDI Models2009-2018
Touran TDI diesels fitted with a DPF are prone to the filter clogging with soot and ash, particularly on cars used for short, low-speed journeys that never reach the temperature needed for regeneration. Ash typically accumulates to problem levels around 80,000-100,000 miles. A blocked DPF triggers a warning light and limp mode; the issue is often compounded by failed glow plugs or software faults that prevent successful active regeneration (fault codes such as 07388 / P2463).
Looking for P242F on a different make?
View P242F across all makes →Frequently Asked Questions
What does P242F mean on Volkswagen?▼
P242F stands for "Diesel Particulate Filter Restriction - Ash Accumulation (Bank 1)." P242F is a generic diesel emissions code indicating the engine control module has detected excessive restriction in the Diesel Particulate Filter (DPF) caused by ash accumulation rather than recoverable soot. Unlike soot, ash cannot be burned off through normal or forced regeneration, so this typically signals the DPF is reaching the end of its service life and needs cleaning or replacement. The condition reduces exhaust flow and can trigger reduced-power (limp) mode if left unaddressed. On Volkswagen specifically, this code is documented across 3 models.
What causes P242F on Volkswagen vehicles?▼
Common causes on Volkswagen: DPF at end of service life with accumulated non-combustible ash from engine oil additives, Excessive oil consumption (worn rings/valve seals) loading the filter with ash, Use of non-low-ash (non-CJ-4/low-SAPS) engine oil, Repeated incomplete or failed regeneration cycles over time, Faulty DPF differential pressure sensor giving high restriction readings. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P242F on a Volkswagen?▼
Repair costs on Volkswagen range from $250 to $1,500, depending on the specific model and root cause.
Which Volkswagen models have P242F documented?▼
Au7o has documented P242F on 3 Volkswagen models: Caddy, Scirocco, Touran.