Why DPFs Clog & How We Fix Them
“My DPF Light Keeps Coming Back!”
A clogged Diesel Particulate Filter (DPF) is the #1 reason Renault–Nissan 1.6 dCi and Vauxhall 2.0 CDTi vans limp into our workshop.
Below we break down why DPFs clog, common myths, and the legal fixes we use every day.
1 · Short Urban Journeys
Low-speed, stop–start routes never heat the exhaust enough for passive regeneration.
After ~200 km of “cold” running, soot loads reach 45 % and the ECU demands a forced regen.
Tip: A 20-minute motorway blast at 2500 rpm every week works wonders.
2 · Faulty Sensors
| Sensor | What It Does | Typical Fault |
|---|---|---|
| Pressure (DPF ΔP) | Measures back-pressure across the filter | Cracked rubber hoses, P2453 |
| Temperature | Confirms exhaust is hot enough to burn soot | Open-circuit probe, P242A |
| NOx / Lambda | Adjusts post-injection fuel | Ageing sensor = rich mixture |
A £45 hose can save a £1 300 filter—scan before spending.
3 · Poor-Quality Fuel & Oil
Cheap diesel and long-life 0W-30 oils with high ash content raise soot grams per litre by up to 20 %.
We recommend low-SAPs C3 oil every 12 000 miles.
Our 3-Step Solution
1 · Dealer-Level Scan
Clip / Tech2 live soot %, ΔP and regen history. Freezes fault frame for proof.
2 · Legal Clean / Regen
Forced regen or **Bardahl® chemical flush**. No illegal deletes.
3 · Sensor & Software Check
Replace weak sensors, update ECU if needed, road-test & print log.
FAQ
Can’t you just delete the DPF?
Deleting is illegal under UK MOT & DVSA regs. We only offer compliant solutions that keep you road-legal.
How long does the clean last?
Most vans stay trouble-free 12–24 months provided you follow driving and service advice.
Pricing Snapshot (ex-VAT)
| Service | Price |
|---|---|
| Diagnostics & report | £60 |
| Forced regeneration | £90 |
| In-situ chemical clean | £180 |
| Off-vehicle ultrasonic clean | £250 |
Book Your DPF Service Today
- Call: +44 7751 216 895
- Email: [email protected]
- Visit: Unit 5, Goodview Road, Basildon (by appointment)
Trusted for safety, chosen for expertise — keep your van’s lungs clear.