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
An owner whose 2015 diesel Mokka was used mainly for short trips reports the particulate filter (DPF) warning coming on and returning, and the car smoking even after a 140-mile run, until the dealer carried out a manual filter clearance. On a 2017 Mokka X 1.6 CDTI, a recurring engine warning light with fault P2002 was cured by fitting the correct differential-pressure sensor, so a warning does not always mean a blocked filter. Applies to: Diesel Mokka and Mokka X: 1.7 CDTI (A17DTS, 2013-2015) and 1.6 CDTI (2015-2019; engine codes including B16DTN, B16DTU, B16DTH and D16DTH). Not the petrol engines. Mileage when it happened, as stated in the linked owner reports: 45,000 km (about 28,000 miles) on a 2017.
Common Symptoms
- DPF warning light comes on within weeks of getting the car
- DPF clogs up again after only 140 miles
- Car started smoking within a couple of weeks
- Yellow engine warning light comes on during fast motorway drives
- Warning light returns after the fault code is cleared
How to Fix
Vauxhall's guide notes that Start/Stop will not stop the engine while the particulate filter is self-cleaning. If the DPF light stays on or keeps returning, have a technician read the fault codes and check the differential-pressure sensor and its hoses before a forced regeneration, a filter clean or a new filter.
Sources for this issue (3)
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)
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, Mokka, Combo.
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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.