DPF, EGR & emissions

DPF, EGR and emissions problems · what to check before buying

Emissions hardware fails on short-journey diesels, and the bill lands on whoever owns the car next. The history tells you more than the car does.

Quick answer

DPF, EGR & emissions appears as a documented fault on 237 models in our library, across 319 separate faults. The most common areas involved are Exhaust, Engine, Emissions, Brakes, Steering, Drivetrain.

What it usually means

  • Repeated regen attempts or a DPF light · the filter is loading faster than it can clear.
  • Sticking EGR valve · rough idle, hesitation and stored codes.
  • AdBlue faults on newer diesels · often sensor or heater related, and dealer-only on some models.
  • A diesel used only for short town trips is the highest-risk buy in this category.

How to check it on the forecourt

  1. 01Ask what journeys the car did · a commute under five miles is a red flag on a diesel.
  2. 02Check the service history for a forced regen or DPF clean.
  3. 03On the test drive, hold 2,000rpm+ for 15 minutes and watch for a regen or a light.
  4. 04Look for evidence of a removed or gutted filter · illegal and an instant test failure.

Models where this is documented

Each entry links to that model's full fault page, with onset mileage, severity and what to inspect.

Audi Q72015–20243 matching faults
  • DPF, EGR and AdBlue faults on 3.0 TDI models· 80,000+ miles
  • Coolant pooling in the engine V due to a leaking coolant shut-off valve or EGR cooler flange on 3.0 TDI models.· 50,000-80,000 miles
  • Quattro centre differential rumble or binding during tight, low-speed turns due to degraded transfer box fluid.· 40,000-70,000 miles
Citroen C4 Picasso2013–20183 matching faults
  • 1.6 BlueHDi diesel particulate filter blocking on short journeys· 60,000+ miles
  • Degraded wet timing belt causing oil starvation and brake vacuum pump failure on 1.2 PureTech models.· 40,000-60,000 miles
  • AdBlue pump failure or tank deformation leading to UREA warning lights and non-start countdowns on BlueHDi models.· 50,000-70,000 miles
Ford Transit Connect2013–20233 matching faults
  • DPF blocking from repeated short journeys· 60,000+ miles
  • 1.5 TDCi injector and EGR faults· 80,000+ miles
  • Low oil pressure warning and brake servo failure due to wet belt degradation.· 60,000-80,000 miles
Land Rover Defender2020–20253 matching faults
  • Coolant loss and sweet smell from the engine bay due to water pump or EGR cooler failure on Ingenium engines.· 30,000-50,000 miles
  • DPF blockage and engine oil dilution causing premature service warnings and potential engine wear.· 15,000-25,000 miles
  • Squealing or chirping noise from the auxiliary belt area due to BISG (Belt Integrated Starter Generator) tensioner wear.· 20,000-40,000 miles
Mercedes-Benz V-Class2014–20253 matching faults
  • EGR and DPF fouling on high-mileage diesel units· 90,000+ miles
  • Harsh downshifts or juddering when pulling away, indicating torque converter wear or degraded ATF in 7G and 9G-Tronic units.· 70,000-100,000 miles
  • AdBlue countdown warning on the dash, typically caused by failed NOx sensors or a faulty AdBlue tank heater element.· 40,000-80,000 miles
Volvo V402013–20193 matching faults
  • DPF blocking on D2 diesels used in town· 70,000+ miles
  • Coolant loss or EML illumination due to a cracked or blocked EGR cooler, particularly on post-2015 VEA 2.0-litre diesel engines.· 50,000-80,000 miles
  • Water ingress into the cabin caused by the factory windscreen bonding degrading, usually at the top corners.· 6-10 years
Audi A12012–20252 matching faults
  • Damp carpets in the boot or excessive interior condensation caused by failed rear air extractor vents or degraded tail light cluster seals.· 5+ years
  • Engine management light, erratic idling, or limp mode resulting from EGR valve failure or heavy carbon build-up on 1.6 TDI models.· 50,000-80,000 miles
BMW 2 Series2014–20252 matching faults
  • EGR cooler and DPF faults on diesel models· 70,000+ miles
  • A distinct metallic clunk or knocking noise from the front end when turning the wheel at low speeds, caused by a worn steering rack thrust piece.· 50,000-70,000 miles
BMW 4 Series2014–20252 matching faults
  • EGR cooler recall and DPF blockage on diesels· 70,000+ miles
  • Clunking or knocking noise from the front end caused by wear in the EPS steering rack thrust piece.· 40,000-80,000 miles
BMW i32013–20222 matching faults
  • Rear end clunking under acceleration or regen braking due to sheared plastic motor mount brackets (primarily pre-2016 models).· 40,000-70,000 miles
  • Spurious 'Drivetrain Malfunction' errors, locked charging cables, or complete vehicle immobilisation due to a degraded 12V battery.· Every 3-4 years
Chevrolet Colorado2015–20222 matching faults
  • CEL / emissions faults on the four-cylinder.· 70,000+ miles
  • DEF (AdBlue) heater or pump failure on the 2.8L Duramax, leading to a speed-limited limp mode.· 50,000-90,000 miles
Citroen Berlingo2018–20252 matching faults
  • DPF blockage on urban diesels· 80,000+ miles
  • UREA warning light illuminated, countdown to non-start, or 'Emissions fault' message due to AdBlue tank/pump failure.· 3-5 years or 50,000-80,000 miles
Citroen C3 Aircross2017–20242 matching faults
  • 1.2 PureTech wet cambelt degrading and blocking the oil pickup· 40,000+ miles
  • 1.5 BlueHDi DPF and AdBlue warnings on short-run cars· 50,000+ miles
Citroen C42014–20252 matching faults
  • 1.2 PureTech wet belt degradation· 60,000+ miles or 6 years
  • BlueHDi DPF and AdBlue faults· 70,000+ miles
Citroen Dispatch2016–20242 matching faults
  • 1.6 and 2.0 BlueHDi turbo and DPF issues on stop-start work· 70,000+ miles
  • AdBlue system faults triggering reduced power warnings· 60,000+ miles
DS DS 3 Crossback2019–20242 matching faults
  • 1.2 PureTech wet cambelt degrading and blocking the oil pickup· 40,000+ miles
  • Diesel DPF and AdBlue system warnings on short-run cars· 40,000+ miles
DS DS 7 Crossback2018–20262 matching faults
  • Diesel DPF and AdBlue faults on urban cars· 50,000+ miles
  • Wet timing belt degradation causing oil starvation· 40,000-60,000 miles
Fiat 500X2015–20242 matching faults
  • 1.6 Multijet diesel DPF blocking on short journeys· 60,000+ miles
  • Coolant leaks leading to potential overheating, commonly originating from a cracked plastic thermostat housing or degraded seal.· 40,000-60,000 miles
Fiat Doblo2010–20222 matching faults
  • 1.6 and 2.0 Multijet diesel turbo and DPF issues· 70,000+ miles
  • Hesitation under acceleration, lumpy idle, and excessive black smoke caused by a clogged or sticking EGR valve.· 60,000-90,000 miles
Fiat Talento2016–20242 matching faults
  • 1.6 and 2.0 dCi turbo and DPF issues on stop-start work· 70,000+ miles
  • Coolant loss or rough idling caused by a cracked EGR cooler or heavily carbon-fouled EGR valve on the 1.6 EcoJet engines.· 60,000-90,000 miles
Ford EcoSport2014–20222 matching faults
  • Side-hinged boot fails to open or requires multiple presses.· 5+ years
  • DPF warning light or sluggish performance on 1.5 TDCi models.· 50,000-80,000 miles
Ford Fiesta2013–20232 matching faults
  • 1.0 EcoBoost wet timing belt degrades and sheds debris into the oil pickup· 60,000+ miles or 6 years
  • Engine misfire, hesitation under load, or an illuminated EML caused by water leaking through the bonnet washer jets into the spark plug wells.· 40,000-70,000 miles
Ford Galaxy2015–20232 matching faults
  • DPF blockage on high-mileage private hire cars· 90,000+ miles
  • Low oil pressure warning and oil starvation from degraded wet timing belt material blocking the oil pickup strainer on 2.0 EcoBlue engines.· 40,000-70,000 miles
Ford Grand C-Max2010–20192 matching faults
  • 1.6 and 2.0 TDCi DPF blockage on short-run cars· 70,000+ miles
  • Standing water in the boot floor or spare wheel well caused by degraded tailgate seals or cracked roof ditch seam sealant.· 5-8 years
Ford S-Max2015–20232 matching faults
  • DPF and EGR cooler faults on 2.0 TDCi cars· 70,000+ miles
  • Low oil pressure warning due to wet timing belt degradation blocking the oil pickup strainer.· 50,000-70,000 miles
Ford Tourneo Connect2013–20262 matching faults
  • 1.5 and 1.6 TDCi DPF blockage on short-journey cars· 60,000+ miles
  • Low oil pressure warnings and brake servo failure on 1.0 EcoBoost models due to a degraded wet timing belt blocking the oil pump strainer.· 60,000-80,000 miles or 7-10 years
Ford Transit2014–20242 matching faults
  • DPF and EGR blockage on stop-start delivery work· 90,000+ miles
  • 'AdBlue system malfunction' warning on the dash, eventually leading to a non-start countdown due to heater or pump failure.· 60,000-80,000 miles
Honda Civic2016–20212 matching faults
  • Wet timing belt degradation causing oil starvation and complete engine failure.· 50,000-72,000 miles or 5-6 years
  • CVT judder or harsh engagement when pulling away from a standstill.· 40,000-80,000 miles
Honda Pilot2016–20222 matching faults
  • Rough idle and illuminated engine management light due to direct fuel injector failure.· 40,000-80,000 miles
  • Grinding or juddering sensation from the rear axle during tight cornering due to degraded differential fluid.· Every 15,000-30,000 miles
Honda Ridgeline2017–20232 matching faults
  • Groaning, grinding, or binding noises from the rear axle during tight, low-speed manoeuvres due to degraded i-VTM4 differential fluid.· Every 15,000-30,000 miles
  • The bonnet vibrates or flutters noticeably at motorway speeds, caused by degraded adhesive between the bonnet frame and skin, or a weak latch.· 3-5 years old
Hyundai i302012–20252 matching faults
  • 1.6 CRDi DPF issues on short-journey cars· 80,000+ miles
  • Clunking or clicking noise from the steering column due to a worn flexible EPS motor coupling (star washer).· 50,000-80,000 miles
Hyundai Ioniq2016–20222 matching faults
  • Rear disc corrosion from regenerative braking· Age-related
  • Whining or clicking noise during acceleration or regenerative braking on BEV models.· 30,000-50,000 miles
Hyundai Santa Fe2013–20182 matching faults
  • Rough idle, hesitation, and illuminated EML caused by a carbon-clogged EGR valve or cooler.· 50,000-80,000 miles
  • Clicking or clunking noise from the steering column due to a degraded rubber flexible coupling in the EPS motor.· 40,000-70,000 miles
Hyundai Tucson2016–20212 matching faults
  • DPF warning light illumination and vehicle entering limp-home mode due to soot accumulation, particularly on 1.7 and 2.0 CRDi models used for short journeys.· 40,000-70,000 miles
  • Noticeable clicking or clunking noise from the steering column when turning the wheel, caused by a degraded flexible rubber coupling within the EPS motor assembly.· 60,000-90,000 miles
Jaguar XF2013–20242 matching faults
  • DPF and EGR faults on diesel models· 80,000+ miles
  • Engine management light, 'DEF Dosing Malfunction' message, and a non-start countdown caused by a blocked or failed AdBlue injector on X260 diesels.· 40,000-70,000 miles
Kia Ceed2012–20252 matching faults
  • Diesel DPF issues on short-journey cars· 70,000+ miles
  • Clunking or clicking noise and slight play when turning the steering wheel off-centre due to a degraded flexible coupling bush.· 40,000-70,000 miles
Kia K52021–20242 matching faults
  • Rattling or creaking noise from the panoramic sunroof over uneven surfaces due to dry tracks or degraded weatherstripping.· 15,000-30,000 miles
  • Rough idle, difficulty starting after refuelling, or an illuminated engine management light caused by a sticking EVAP purge control valve.· 40,000-60,000 miles
Kia Niro2016–20252 matching faults
  • Rear disc corrosion from regenerative braking· Age-related
  • Coolant loss and sweet smell from the exhaust heat recovery system (EHRS) or EGR cooler on 1.6 GDi models.· 50,000-80,000 miles
Kia Sportage2017–20222 matching faults
  • Clunking or clicking noise when turning the wheel· 50,000-80,000 miles
  • DPF blockage and rising engine oil levels on CRDi models· 40,000-70,000 miles
Kia Venga2010–20192 matching faults
  • Knocking or clicking noise from the steering column due to a degraded EPS motor flexible coupling (star washer).· 50,000-80,000 miles
  • DPF blockage or EGR valve sticking on CRDi diesels used for short urban trips, leading to limp mode.· 60,000-90,000 miles

Showing the 40 models with the most documented matches · browse the full library.

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