P244A on Audi: How to Diagnose & Fix
Diesel Particulate Filter Differential Pressure Too Low (Bank 1)
2 Audi models · 2 documented issues · $200-$3,000 repair
P244A on Audi by model: symptoms, diagnosis and fix
The DPF can become clogged, especially with city driving and short trips that don't allow for proper regeneration cycles. This is more common after the emissions fix was applied. A clogged DPF causes reduced power and warning lights. OEM DPF assembly part numbers: 1K0254706LX (earlier production) and 1K0254708GX (later production). Fits 2009-2014 Audi A3 TDI with CBEA/CJAA engines. DPF differential pressure sensor: available from KermaTDI for CJAA/CKRA engines.
Common Symptoms
- DPF warning light
- Reduced power (limp mode)
- Increased fuel consumption during regen
- Strong exhaust smell during regen
- Check engine light with DPF codes
How to Fix
Allow DPF regeneration by driving at highway speeds (65+ MPH) for 15-20 minutes regularly. For forced regen via VCDS: go to adaptation, enter security code 12233, change channel 18 from 0 to 1 while maintaining highway speed. Monitor soot levels via VCDS (Particle Filter Carbon Mass). If severely clogged, professional DPF cleaning with Liqui Moly 20110 DPF Cleaning Fluid (used with 20112 DPF Cleaning Flush and 7945/7946 spray tools) can help. Note: cleaning removes soot only, not ash - ash accumulation requires DPF replacement. OEM replacement DPF often back-ordered for weeks.
Sources for this issue (1)
Q2 TDI diesels (1.6 TDI / 2.0 TDI) suffer from DPF clogging when the car is mostly used for short, low-speed urban journeys. The soot filter never reaches the exhaust temperature needed to complete a passive/active regeneration, so soot accumulates, the DPF warning light comes on, and the car may enter a forced-regen cycle or limp mode. Repeated interrupted regens (driver slowing/stopping before the cycle finishes) make it worse and can dilute engine oil with diesel.
Common Symptoms
- DPF / exhaust-emissions warning light on
- Reduced power / limp mode
- Frequent regenerations, increased fuel use
- Rising engine oil level (diesel dilution)
How to Fix
Drive at a steady speed (>60 km/h / ~40 mph) under moderate load for 15–30 minutes to allow regeneration to complete; if blocked, the dealer performs a forced/static regeneration with diagnostic equipment. Severely blocked filters need professional DPF cleaning or replacement. Long-term: avoid exclusively short trips.
Sources for this issue (1)
P244A code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P244A mean on a Audi?
P244A stands for "Diesel Particulate Filter Differential Pressure Too Low (Bank 1)." P244A is a diesel emissions code meaning the differential pressure across the diesel particulate filter (DPF) on bank 1 is too low. A pressure sensor measures the difference between the DPF inlet and outlet to gauge how loaded with soot the filter is; an abnormally low reading suggests the filter isn't restricting flow as expected. This can indicate a cracked, missing, or hollowed-out DPF substrate, or a sensor/hose problem giving a false low reading. It points to the DPF or its differential pressure sensing system rather than the engine itself. On Audi it is documented across 2 models: A3, Q2.
What are the most common causes of P244A?
The most common causes of P244A are: Cracked, damaged, or failed (hollow) DPF substrate, Faulty DPF differential pressure sensor, Disconnected, cracked, or leaking pressure sensor hoses, Clogged or blocked pressure sensor reference lines, Exhaust leak upstream or around the DPF, Aftermarket or tampered/removed DPF, Wiring or connector fault at the pressure sensor. The specific cause varies by vehicle.
How much does it cost to fix P244A on a Audi?
Published repair estimates on Audi range from $200 to $3,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P244A on a different make?
View P244A across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.