P244A on Audi
Diesel Particulate Filter Differential Pressure Too Low (Bank 1)
P244A on Audi vehicles indicates diesel particulate filter differential pressure too low (bank 1). Au7o has documented this code across 2 Audi models — most commonly on A3, Q2. 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. Typical repair costs on Audi range from $200 to $3,000, depending on the specific model and root cause.
Common Causes of P244A
- •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
P244A on Audi by Model
Audi A3(1 issue)
- DPF (Diesel Particulate Filter) Clogging2010-2015
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.
Audi Q2(1 issue)
- Diesel particulate filter (DPF) clogging on TDI engines used for short trips2016-2020
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.
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What does P244A mean on 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 specifically, this code is documented across 2 models.
What causes P244A on Audi vehicles?▼
Common causes on Audi: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P244A on a Audi?▼
Repair costs on Audi range from $200 to $3,000, depending on the specific model and root cause.
Which Audi models have P244A documented?▼
Au7o has documented P244A on 2 Audi models: A3, Q2.