Emissions control: EGR, DPF, catalytic converter and AdBlueGeneric OBD-II codeUrgency: Garage soon
Code P2002: low particulate filter (DPF) efficiency
P2002 means: diesel particulate filter efficiency below threshold (bank 1).[1][2] The control unit checks whether the particulate filter (DPF) is retaining soot as it should: it compares the exhaust gas pressure and temperature at the filter inlet and outlet. If the amount of particles it captures falls below the minimum calibrated by the manufacturer, it stores the code.[1][3]
What code P2002 means
The control unit checks whether the particulate filter (DPF) is retaining soot as it should: it compares the exhaust gas pressure and temperature at the filter inlet and outlet. If the amount of particles it captures falls below the minimum calibrated by the manufacturer, it stores the code.[1][3]
The warning does not distinguish between a filter that really lets particles through and sensors that report its behaviour wrongly. On VW group diesels, Ross-Tech cites two possible causes: the exhaust pressure sensor (G450) or the filter itself.[3][4]
"Bank 1" indicates the side of the engine the check refers to; P2003 is the equivalent warning for bank 2. It is a generic OBD-II code (it starts with P2), so it means the same on any make.[1][3][5]
Original definition (SAE J2012): Diesel Particulate Filter Efficiency Below Threshold Bank 1[1][2]
Causes of P2002
From most to least likely, according to the sources.
- 1Faulty differential pressure sensor for the filter, or damaged sensor hoses, giving a wrong reading. Ross-Tech documents sensors that were faulty from the factory on some Skoda Superb (3U) and VW Passat (3B) models with certain engines, which distorted the calculation of the filter load and caused failed regenerations.[1][2][4]
- 2The particulate filter itself, damaged or degraded, no longer retaining particles as effectively as intended.[1][2][4]
- 3Air or exhaust gas leaks upstream of the filter.[1][2]
- 4Poor-quality diesel with excess sulphur, which can clog the filter.[1][2]
- 5Regenerations that do not complete: always driving slowly or making only short journeys prevents the soot from burning off properly.[1][6]
- 6Other, less commonly cited causes: dirty air filter, faulty control unit or non-original parts that alter the exhaust.[1]
Symptoms
- Engine warning light on. For some drivers it is the only symptom.[1][2][4]Engine warning light: faults that cause it
- Slower acceleration or loss of performance.[1][2]Less power: faults that cause it
- The car may go into limp mode, with power and speed limited to protect the engine.[1][6]Limp mode: faults that cause it
- Increased fuel consumption.[1][2]Uses more fuel: faults that cause it
- Black smoke from the exhaust when accelerating.[2]Black smoke: faults that cause it
- On some cars a faulty emissions control system message appears.[6]Pollution control faulty: faults that cause it
How to diagnose P2002
In order: from the most likely and cheapest to check to the most expensive.
- 1Consult the workshop manual and the manufacturer's bulletins, read the codes with a diagnostic tool and resolve any other stored code first.[1][2]
- 2Check the filter's differential pressure sensor and the hoses connecting it to the filter (cracks, blockages), as well as its connector and wiring. If the sensor is doubtful, replace it before touching the filter.[1][2][4]
- 3Look for air or exhaust leaks upstream of the filter and repair them.[1][2]
- 4If you suspect the fuel, take a motorway run before repairing anything: it may be enough to clean the filter. After that, filling up at reliable stations helps prevent a repeat.[1][2]
- 5Start a regeneration with the diagnostic tool, or let the automatic one complete, and check whether the code returns. On VW group cars there is an emergency regeneration procedure that must be followed to its specifications.[1][4]
- 6Remove any recently fitted non-original exhaust or performance parts, because they may be obstructing the flow of gases.[1]
- 7Only if everything above is fine, clean or replace the filter, which is the most expensive repair. Remember that a faulty sensor can make a healthy filter look bad.[1][3][4]
Can I keep driving with P2002?
Garage soon
Mechanic Base rates it as medium severity: you do not need to stop immediately and you can get home or to the workshop, but you should not carry on like this because the car may go into limp mode with limited power. HELLA states that if the regeneration warning light stays on or flashes, the regeneration cannot complete and you need to go to a specialist workshop straight away to avoid serious engine damage. RACE advises against driving in limp mode because it increases pressure and temperature in the exhaust and can damage other components.[1][6][7]
Documented faults related to P2002
Known faults of specific engines and cars, with their repair cost, the affected years and their sources.
Particulate filter (DPF/FAP): the most serious faults by engine and car
- High severityVery frequentFrequency: Very frequentOM651EGR and particulate filter clogging, and emissions software updatesThe particulate filter and EGR clog up with short journeys, as on any diesel with these systems. In addition, Germany's KBA required software updates on several models with this engine between 2018 and 2021 because of a function that reduced EGR outside a temperature range.Repair (garage): €800–€2,500
- High severityCommonFrequency: Common1.3 MultijetIncomplete particulate filter regenerations and oil dilutionIn heavy urban use, with short journeys that do not let the particulate filter regeneration finish, unburnt diesel passes into the sump and dilutes the oil; the level can rise on the dipstick and the oil loses its ability to lubricate. Repeated many times, it speeds up engine wear.
- High severityCommonFrequency: Common2.0 HDiDPF clogging on additive-type systems (Eolys/cerine)The additive-type diesel particulate filter (DPF) of the 2.0 HDi clogs relatively easily on short journeys, especially on the 107/110 and 136-140 hp versions. The anti-pollution warning light comes on and, if ignored, the car loses power and may end up needing a new DPF.
- High severityCommonFrequency: Common1.6 and 2.0 MultiJet IISaturated diesel particulate filter (DPF) from incomplete regenerationsIn urban use with short journeys, the particulate filter does not manage to complete its regeneration and becomes saturated; garages recommend a weekly motorway run to avoid it. The filter itself is among the weak points flagged in the 1.6 and 2.0 MultiJet II after a certain mileage.
Engine sensors: the most serious faults by engine and car
- High severityOccasionalFrequency: Occasional2.0 DTI and 2.2 DTIVP44 injection pump and air mass meter failureGerman Wikipedia documents recurring failures of the Bosch VP44 injection pump and the air mass meter in the early years of this engine. An owner testimony for this engine describes the pump being replaced at 192,500 km, at a cost the owner calls «prohibitive».
- Medium severityCommonFrequency: Common2.0 TDIClogged particulate filter or faulty pressure sensorThe 2.0 TDI's particulate filter clogs if the car mostly makes short journeys, because it never gets to regenerate; sometimes the fault is just the differential pressure sensor. Cleaning it costs around €200 and replacing it, €800 to €3,000.Repair (garage): €800–€3,000
- Medium severityCommonFrequency: Common1.4 and 1.6 8vCrankshaft position sensor failure (TDC sensor)The crankshaft position sensor (capteur PMH, or TDC sensor) appears repeatedly in the reliability sources for the Clio II, the Kangoo I and the Dacia Logan I with this engine, with hard cold starting or stalling as the main symptoms. It is a cheap part, but the failure can leave you stranded.
- Medium severityCommonFrequency: Common1.4 and 1.6 16vCrankshaft position sensor failureThe crankshaft position sensor (capteur PMH) appears repeatedly in the reliability sources for almost every generation with this engine, with hard cold starting, stalling or the car cutting out unexpectedly. It is a cheap part, but the failure can leave you stranded.
Frequently asked questions
What is the difference between P2002, P2463 and P242F?
All three affect the particulate filter, but they measure different things. P2002 is an efficiency code: the control unit detects that the filter is retaining fewer particles than expected or that its sensors are reporting wrongly. P2463 and P242F are blockage codes: with P2463 the filter is full of soot, which is removed by burning it off in a regeneration; with P242F it is full of ash, the residue left after soot is burned and which a regeneration does not remove, so the filter has to be cleaned or replaced.[3][7][8][9]
Can I drive with code P2002?
You can get home or to the workshop, but you should not keep using the car as normal: it may go into limp mode and, if the regeneration warning light does not go out, the parts manufacturer HELLA recommends going to a workshop straight away.[1][6][7]
Does the particulate filter have to be replaced when P2002 appears?
Not necessarily. The usual approach is to start with the pressure sensor, its hoses, air or exhaust leaks and fuel quality, and to clean or replace the filter only if the tests point to it. A faulty sensor can make a filter that is fine look bad.[1][2][3][4]
Can a motorway run or a regeneration clear P2002?
Sometimes: if the origin is poor-quality fuel or incomplete regenerations, driving for a while on a motorway or forcing a regeneration can clean the filter. If the problem is a damaged filter or a faulty sensor, a regeneration will not fix it.[1][2]
Does P2002 mean the same on all makes?
Yes. Codes that start with P2 are generic OBD-II codes and have the same definition at every manufacturer. What changes is the most likely cause, which depends on the engine.[5]
Will I pass the MOT with code P2002?
If the code has switched on the engine warning light, no: with that light on, the inspection records a serious defect, and on Euro 5 and Euro 6 cars the ITV (Spain's roadworthiness inspection, similar to the MOT) also reads the OBD diagnostic system. Repair the fault before you go; clearing the code just before the inspection does not help either, because it counts as a serious defect.[10]
Not sure what is wrong with your car? Describe what you notice in the symptom diagnosis or see all fault codes.
Sources
Every fact on this page links to its source. If you find an error, let us know.
- 1.What Does The P2002 Code Mean?Mechanic Base · Technical documentation · published 21 March 2024 · consulted 2 October 2026
- 2.PartsAvatar.ca - Solution of OBD Code Error P2002PartsAvatar · Technical documentation · published 2 June 2022 · consulted 2 October 2026
- 3.P2002 - Particulate Trap Efficiency Below Threshold - Bank 1 | TaTThe Automotive Technician (TaT) · Technical documentation · consulted 2 October 2026
- 4.18434/P2002/008194 - Particle Filter Bank 1: MalfunctionRoss-Tech · Technical documentation · consulted 2 October 2026
- 5.On-board diagnosticsWikipedia · Other source · consulted 2 October 2026
- 6.¿Qué es el sistema antipolución del coche y qué averías puede sufrir?RACE · Motoring press · published 25 September 2026 · consulted 2 October 2026 · in Spanish
- 7.El sistema DPF (Filtro de Partículas Diésel) - Boletín InformativoHELLA · Manufacturer · published 2015 · consulted 2 October 2026 · in Spanish
- 8.P2463 Fault Code Definition & Info | TaTThe Automotive Technician (TaT) · Technical documentation · consulted 2 October 2026
- 9.P242F Fault Code Definition & Info | TaTThe Automotive Technician (TaT) · Technical documentation · consulted 2 October 2026
- 10.Desmontando mitos: ¿puede pasar mi coche la ITV con el testigo de «avería motor» encendido?Diariomotor · Motoring press · published 8 March 2021 · consulted 2 October 2026 · in Spanish