DPF & Engine Fault Diagnosis in Trowbridge
The diesel particulate filter (DPF) removes soot from exhaust gases. Over time, particularly with lots of short journeys, it can become blocked. When the self-cleaning process fails, the warning light comes on. We diagnose and resolve DPF issues correctly — whether that's a forced regeneration, a clean, or in severe cases, a replacement.
DPF SERVICES
What We Do for DPF Issues
- DPF warning light diagnosis and fault code reading
- Forced DPF regeneration using professional diagnostic software
- DPF cleaning — on-vehicle or off-vehicle deep clean
- DPF pressure sensor replacement
- EGR valve cleaning and replacement
- DPF replacement where necessary
- Advice on driving habits to prevent future DPF blocking
ENGINE FAULTS
Engine Issues We Diagnose & Repair
- Engine management light and fault code diagnosis
- Turbocharger faults and boost pressure issues
- Fuel injector faults and injection system diagnosis
- Compression testing and internal engine health checks
- Coolant and oil leak diagnosis
- Exhaust and emissions faults
- General engine noise and performance diagnosis
ADVANTAGES
Why Choose NGM Motors
- We diagnose first — we don't guess and replace expensive parts unnecessarily
- Professional software to carry out forced DPF regeneration
- Transparent approach — if a DPF is beyond saving, we'll tell you honestly
- Full engine diagnostic capability for all common faults
- Clear, fixed-price estimates before work begins
WARNING SIGNS
Signs of DPF or Engine Problems
- DPF warning light on the dashboard
- Reduced power or limp mode
- Excessive black smoke from the exhaust
- Poor fuel economy — particularly on diesel vehicles
- Engine warning light on
- Rough running, misfiring or loss of power
- Strong fuel smell from exhaust
Frequently Asked Questions
You can clear the code, but if the underlying blockage isn't resolved the light will return. The correct fix is to address the root cause — which may require a forced regeneration or professional cleaning.
Short journeys are the main cause. The DPF regenerates by burning off soot at high temperature, which requires sustained motorway-speed driving. Town driving and lots of short trips prevent this.
Yes. In severe cases, engine oil can become contaminated with diesel fuel and soot from incomplete regeneration attempts. Address the warning light promptly.
DPF removal is illegal for road use in the UK and will cause your vehicle to fail its MOT. We do not carry out DPF deletions. We restore your DPF to working order.
Call us or message on WhatsApp — we'll sort it out quickly.