Bob's Mechanical Repairs

P2002 — Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].

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The DPF is not filtering soot as effectively as the ECU expects — either genuinely loaded, damaged, or the differential pressure sensor is lying.

P2002 means the DPF is not filtering efficiently enough for the ECU. In the UK it is usually a genuinely blocked filter from short journeys, a failed pressure sensor or leaking pipes. A sensor is £60 to £150 fitted, a forced regen £90 to £150, a replacement DPF £700 to £1,800.

Answered by Bob — 32 years on the tools, DVSA-approved MOT centre, Birnam, Perthshire.

P2002 — also written P2OO2, P 2002, 2002 — is the OBD-II code for diesel particulate filter efficiency below threshold (bank 1). Same code, same fix: this page covers every spelling of it.

This code means the car thinks the DPF isn't catching the soot, often because the internal ceramic brick has cracked or the pressure pipes have perished. It's a classic headache on high-mileage VW monitors and Euro 5 Transporters.

P2002 is a emissions fault code, typically costing £120–£1600 to put right in a UK garage.

What P2002 actually feels like to drive

  • The 'Engine Service Now' message on the dash, often without a limp mode initially.
  • Thick black soot deposits around the inside of the tailpipe (it should be clean enough to eat off).
  • A heavy smell of diesel fumes inside the cabin when sitting at traffic lights.
  • The car seems to perform fine but the 'DPF Full' warning keeps popping up every 50 miles.
  • Excessive cooling fan noise because the car is constantly trying (and failing) to start a regeneration.

What causes P2002?

  • Soot loading from short-journey driving
  • Blocked or kinked DPF pressure pipes
  • Failed differential pressure sensor
  • Cracked or hollowed-out filter substrate
  • Repeated interrupted regenerations

UK vehicles that throw P2002 most often

  • Ford Focus 1.6 TDCi (DV6) 2011-2015
  • Volkswagen Transporter T5/T6 2.0 BiTDI (CFCA) 2010-2016
  • Nissan Qashqai 1.5 dCi (K9K) 2008-2014
  • Land Rover Discovery Sport 2.0 TD4 (Ingenium) 2015-2019
  • Vauxhall Vivaro 1.6 CDTi (R9M) 2014-2018

How P2002 is fixed

  • Read soot and ash loading on live data before spending anything
  • Clean or replace the DPF pressure pipes and sensor
  • Forced regeneration if soot loading is high but ash is low
  • Off-car DPF clean, or replacement if the substrate is damaged

The P2002 misdiagnosis that wastes money

I see it every week: a customer arrives with a brand new Bosch pressure sensor they've fitted themselves, and the light is still on. They assume because the code mentions 'efficiency,' the sensor must be lying. In reality, it’s usually the tiny rubber hoses connecting the sensor to the DPF. On the 1.6 TDCi Fords especially, these pipes perish or melt. If there’s even a pinhole leak, the sensor sees the wrong pressure and pukes out P2002. People waste £150 on sensors and 'DPF cleaning' fluids when a £20 bit of rubber hose was the actual culprit.

What a UK garage should charge for P2002

If it's just the rubber pressure pipes, you’re looking at £80 to £120 including labour. A genuine sensor is usually £100-£150 plus half an hour's fitting. However, if the DPF ceramic has actually failed (cracked), a quality aftermarket unit like a BM Catalysts or EEC part will cost £450-£700. If you go to a main dealer for a genuine DPF on a Range Rover or VW, don’t be surprised to see a bill north of £2,200. Always check the pipes first!

P2002 repair cost in the UK

Most P2002 repairs land between £120–£1600 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.

Bob's tip on P2002

Ask the garage for a 'manual backpressure test.' Don't just let them read the code and quote for a new DPF. A proper tech will hook up a mechanical gauge to the DPF pressure line. If the gauge shows high pressure but the diagnostic tool shows low, your sensor is toast. If the gauge shows almost zero pressure while you rev it, your DPF substrate is likely cracked or has been 'gutted' by a previous owner to hide a soot problem. Also, if you’ve just bought the car, check the DPF weld marks; if it's been cut open and emptied, it’s an automatic MOT fail and a massive bill for you.

Can you drive with P2002?

Keep journeys long and avoid stop-start driving until it is sorted. A fully blocked DPF can strand you.

Urgency: high.

P2002 on specific UK makes

P2002: quick answers

Can I drive with P2002?

Yes, but the right drive matters. A 20–30 minute run at a steady 50–70mph on a dual carriageway or motorway often lets the DPF burn itself clean. Keep doing short town trips and it will block further, and the car will eventually drop into limp mode.

How much does P2002 cost to fix in the UK?

A forced regen at a garage is usually £90–£200. A professional DPF clean is £250–£450. A new DPF is £900 or more. Catch it early and the cheap end is far more likely.

Will a DPF cleaner additive fix P2002?

Sometimes, if the filter is only lightly loaded and you follow it with a proper long run. It won't rescue a DPF that's already heavily blocked or full of ash — that needs a forced regen or a clean.

Will P2002 fail an MOT?

If P2002 has the engine warning light on when the car goes in, yes — an illuminated engine management light is an MOT failure. Clearing the code the morning of the test doesn't work either: the readiness monitors reset and the tester can see it. Fix the cause, drive the car for a few days, then book the test.

Read the code but still stuck? A code is a clue, not a diagnosis. Fault code help walks through the free next steps, whether a garage quote is fair, and when to stop driving — with a written mechanic answer for £14.99 if you need one.