P2002 on Citroen
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
P2002 on Citroen vehicles indicates diesel particulate filter efficiency below threshold (bank 1). Au7o has documented this code across 3 Citroen models — most commonly on Berlingo, C4, C5 Aircross. 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 Citroen range from $300 to $2,500, 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 Citroen by Model
Citroen Berlingo(1 issue)
- DPF Blockage in Urban Use2008-2026
The Berlingo diesel DPF blocks prematurely when used for short urban journeys and commercial delivery work. The van duty cycle of frequent stops and starts prevents the DPF from reaching regeneration temperature.
Citroen C4(1 issue)
- Diesel DPF Regeneration Issues2004-2026
The C4 diesel models suffer from the common PSA DPF regeneration problems, with the additive-based system requiring regular Eolys fluid top-ups. Short journey use prevents passive regeneration from completing.
Citroen C5 Aircross(1 issue)
- DPF Regeneration Failure2019-2026
The C5 Aircross BlueHDi engines experience DPF regeneration failures in urban driving conditions. The larger SUV body and heavier weight mean the engine works harder yet rarely reaches optimal regeneration temperatures in city traffic.
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View P2002 across all makes →Frequently Asked Questions
What does P2002 mean on Citroen?▼
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 Citroen specifically, this code is documented across 3 models.
What causes P2002 on Citroen vehicles?▼
Common causes on Citroen: 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 Citroen?▼
Repair costs on Citroen range from $300 to $2,500, depending on the specific model and root cause.
Which Citroen models have P2002 documented?▼
Au7o has documented P2002 on 3 Citroen models: Berlingo, C4, C5 Aircross.