A diesel particulate filter sits in the exhaust and traps soot. On a van that lives on short Bournemouth and Poole rounds — school runs between sites, stop-start delivery loops, cold starts — the filter rarely gets a sustained high-load run long enough for a clean passive regen. The ECU then forces active regeneration: extra fuel, higher exhaust heat, and a carefully managed burn.
Ignore the first “exhaust filter” or DPF message and soot keeps climbing. Back pressure rises, power falls, and limp mode arrives mid-job. A forced garage regen can clear a lightly loaded filter. Once ash has packed the substrate, dealers quote a new canister — commonly £1,000 to £3,000 for Transit Custom, Partner and Transporter platforms — which is when fleets start searching for van DPF delete Dorset options.
Trade vans also stack other dash service messages at the same mileage. We still scan the DPF differential pressure and regen history before anyone decides between a forced regen, a hardware filter or software.








