EGR & DPF Diagnostics and Cleaning
Restore performance, prevent costly repairs, and keep your engine running clean.

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At South Coast Mapping, we offer expert diagnostics and professional cleaning services for blocked or faulty EGR valves and DPF (Diesel Particulate Filters). If your vehicle is struggling with performance issues, warning lights, or limp mode caused by carbon build-up or exhaust faults, we can help — quickly, reliably, and without the dealership price tag.
Modern diesel engines rely on the DPF and EGR system to reduce emissions. But over time, especially on vehicles used for short journeys, these systems can become clogged with soot and carbon, leading to poor performance, high fuel consumption, warning lights, and even engine damage if ignored.
We carry out thorough diagnostics using dealer-level tools to accurately identify the cause of any EGR or DPF-related fault. Whether it’s a blocked filter, sticking valve, failed sensor, or regeneration issue, we’ll pinpoint the problem before recommending the best solution.
In many cases, a full carbon clean and DPF regeneration is enough to restore proper function and avoid expensive part replacements. We also offer safe, non-invasive cleaning options that remove carbon build-up and improve airflow, helping your engine run more efficiently.
- Full Diagnostics – We use advanced, dealer-level diagnostic tools to accurately identify DPF blockages, EGR valve faults, and sensor failures.
- Professional Cleaning – Safe, non-invasive carbon cleaning and on-car DPF regeneration to restore performance and prevent costly replacements.
- Mobile Service – We come to your location anywhere across Chichester and the South Coast
- Fast, Effective Solutions – Most issues can be diagnosed and resolved the same day, with honest advice and no unnecessary upselling.
Mobile, Honest & Hassle-Free
Our service is fully mobile across Chichester and the South Coast. We’ll come to you, carry out full diagnostics, and get your vehicle sorted on the spot in most cases. With over 25 years of experience, you’re in safe hands.
If needed, we can also offer software-based solutions for off-road or motorsport use only — including EGR or DPF delete. These are not road-legal in the UK but may be suitable in specific use cases. We’ll always explain your options clearly so you can make an informed choice.