P2002 on Audi
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
P2002 on Audi vehicles indicates diesel particulate filter efficiency below threshold (bank 1). Au7o has documented this code across 3 Audi models — most commonly on A1, A3, Q2. P2002 indicates that the diesel particulate filter (DPF) on bank 1 is performing below its required efficiency threshold. The DPF captures and stores soot from diesel exhaust and periodically burns it off (regeneration); the engine computer monitors exhaust pressure across the filter and other data to judge how well it's trapping and clearing soot. When that efficiency falls too low, this code sets. Symptoms can include reduced power, a clogged-filter warning, frequent or failed regenerations, and increased emissions. Typical repair costs on Audi range from $200 to $3,000, depending on the specific model and root cause.
Common Causes of P2002
- •Clogged or damaged diesel particulate filter
- •Failed or incomplete DPF regeneration (mostly short trips)
- •Faulty differential (DPF) pressure sensor or hoses
- •Faulty exhaust temperature sensor(s)
- •Exhaust leak before or across the DPF
- •Engine running issues causing excess soot (injectors, EGR, turbo)
- •Use of incorrect (non-low-ash) engine oil or fuel quality issues
P2002 on Audi by Model
Audi A1(1 issue)
- 1.6 / 2.0 TDI Diesel DPF Clogging and EGR Valve Faults2010-2018
The A1 is sold mainly as a town/city car, so diesel (1.6 TDI / 2.0 TDI) owners doing short, stop-start journeys never get the diesel particulate filter hot enough for passive regeneration. The DPF clogs with soot, and a faulty/sticking EGR valve accelerates this by raising soot output. Failed active regens can also dilute the engine oil with diesel. A blocked DPF triggers limp mode and is expensive to replace.
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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View P2002 across all makes →Frequently Asked Questions
What does P2002 mean on Audi?▼
P2002 stands for "Diesel Particulate Filter Efficiency Below Threshold (Bank 1)." P2002 indicates that the diesel particulate filter (DPF) on bank 1 is performing below its required efficiency threshold. The DPF captures and stores soot from diesel exhaust and periodically burns it off (regeneration); the engine computer monitors exhaust pressure across the filter and other data to judge how well it's trapping and clearing soot. When that efficiency falls too low, this code sets. Symptoms can include reduced power, a clogged-filter warning, frequent or failed regenerations, and increased emissions. On Audi specifically, this code is documented across 3 models.
What causes P2002 on Audi vehicles?▼
Common causes on Audi: Clogged or damaged diesel particulate filter, Failed or incomplete DPF regeneration (mostly short trips), Faulty differential (DPF) pressure sensor or hoses, Faulty exhaust temperature sensor(s), Exhaust leak before or across the DPF. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2002 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 P2002 documented?▼
Au7o has documented P2002 on 3 Audi models: A1, A3, Q2.