P2002 on Opel: How to Diagnose & Fix
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
3 Opel models · 3 documented issues · 1 critical · $200-$1,800 repair
P2002 on Opel by model: symptoms, diagnosis and fix
The 1.6 CDTI (B16DTH/B16DTE) "Whisper Diesel" in the Astra K suffers from a well-documented EGR cooler failure: the cooler's internal sleeve cracks, letting coolant leak into the intake/exhaust tract. Owners report white smoke at start-up, unexplained coolant loss with no visible external leak, and exhaust smell inside the cabin. UK owners on Astra K Forums report a cluster of EGR and DPF failures, several after the diesel emissions software update, with code P0401 (insufficient EGR flow) commonly logged. The same engine is also prone to DPF clogging on short-trip use and to injection-quantity drift on individual injectors, compounding rough running. German forums (astra-k-forum.de) and German troubleshooting sites document identical failures, making this a cross-market consensus issue for 2015-2019 diesel Astra K models.
Common Symptoms
- White smoke from exhaust at cold start
- Coolant level drops with no visible leak
- Exhaust smell inside the cabin
- Check engine light with code P0401
- Frequent DPF regenerations or DPF warning
- Rough running or jerking at light load
How to Fix
Pressure-test the cooling system and inspect the EGR cooler for internal leakage; check for coolant residue in the intake tract. Vauxhall/Opel sells the complete EGR cooler/valve assembly (around GBP 800-1000 in parts), but the cracked cooler sleeve alone is available as a separate part for roughly GBP 80 plus about an hour of labour, so insist on a sleeve-level repair quote first. Clean or force-regenerate the DPF if short-trip clogging is present, and have injector quantity corrections read out; replace and code any injector outside tolerance. Avoid sustained short-trip driving with this engine.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Opel/GM 55509027 EGR cooler and valve assembly
Opel Astra J/K 1.6 CDTI B16DTH only on the retailer fitment; verify VIN and OE supersession.
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Sources for this issue (7)
- Astra K 2019 1.6 CDTI suspected EGR cooler issue? | Vauxhall Astra K Forumforum
- p0401 egr cooler | Vauxhall Astra K Forumforum
- EGR cooler failure after emissions update | Vauxhall Astra K Forumforum
- Opel Astra K: Typische Probleme und Diagnose | KFZ Dietrich (documents 1.6 CDTI AGR-Kühler internal leak, DPF short-trip clogging, injector quantity drift)article
- Astra K emissions recall (NOx ECU update; EGR/DPF failures reported afterwards) | Vauxhall Astra K Forumforum
- P0401 - Still present after EGR Valve and cooler replaced | Vauxhall Astra K Forumforum
- Opel Astra K Probleme und Lösungen | autoprobleme24.de (supports DPF clogging + injector issues on 1.6 CDTI; no EGR cooler mention)article
Combo diesels (1.5 BlueHDi) used mainly for short, low-speed urban trips suffer from EGR valve carbon build-up and diesel particulate filter (DPF) blockage. The engine never reaches the temperature needed for passive/active DPF regeneration, so soot accumulates. A clogged DPF raises exhaust back-pressure, which alters EGR flow, while a sooty EGR increases soot output, creating a feedback loop that produces multiple emissions faults at once. Symptoms include rough idle, power loss, higher fuel use and limp mode. This is a well-known characteristic of the PSA/Stellantis diesels shared with the Berlingo/Rifter.
Common Symptoms
- DPF / engine warning light
- Limp mode / reduced power
- Rough idle and hesitation
- Increased fuel consumption
- Frequent or incomplete DPF regenerations
- Smell of unburnt diesel
How to Fix
Drive for at least 10-15 minutes at 65 km/h (~40 mph) or more regularly to allow the DPF to regenerate. Use the correct low-ash (low-SAPS) diesel oil. If already clogged, perform a forced regeneration via diagnostics, clean or replace the EGR valve, and clean or replace the DPF. Address any leaking injectors or weak turbo boost that overload the DPF with soot. Buyers doing only short trips should consider the petrol model instead of the diesel.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine 9829870080 five-pin EGR valve
Confirm VIN and five-pin OE 9829870080.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (2)
On the CDTI diesel Mokka/Mokka X driven mainly on short city journeys, the DPF cannot reach the temperature needed for passive/active regeneration and progressively clogs with soot, often as early as 30,000-50,000 km. This produces reduced power, increased fuel use, repeated regeneration warnings and exhaust aftertreatment fault codes; a blocked DPF that never completes regeneration eventually needs forced regen or replacement. The issue is tightly linked to the EGR carbon problem on the same engines.
Common Symptoms
- DPF / particulate filter warning light
- Reduced power
- Black smoke from exhaust
- Increased fuel consumption
- Frequent failed regenerations
How to Fix
Take the car on regular sustained motorway drives to allow active regeneration; when clogged, perform a forced (static) regeneration with a diagnostic tool or professional DPF clean. A failed/blocked filter must be replaced. Fix any underlying EGR, injector or sensor faults that prevent successful regen.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Cats2U VX6162T catalyst and DPF for Mokka 1.6 CDTI
Confirm B16/D16 engine, emissions level, drive layout, VIN and OE references.
- DPF-G9096 replacement filter for Mokka 1.7 CDTI A17DTS
Confirm VIN and FWD/AWD homologation.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (2)
P2002 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 P2002 mean on a Opel?
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 Opel it is documented across 3 models: Astra, Combo, Mokka.
What are the most common causes of P2002?
The most common causes of P2002 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P2002 on a Opel?
Published repair estimates on Opel range from $200 to $1,800 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 P2002 on a different make?
View P2002 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.