Regular TDI work at the B37 workshop
What the DPF is doing
A diesel particulate filter traps soot. The car then burns it off in a regeneration when the exhaust is hot enough. If you only do short trips around Chelmsley Wood and Solihull, the regen never finishes. Soot builds up. Then you get a light, limp mode, or a bill for a filter.
What we see first
We scan it, look at soot loading and last regen, then road-test or force a regen if the filter is still in a range where that works. A filter that is packed solid will not regen back to health. Then you are talking replacement, not magic additive in the tank.
- Pressure sensor pipes cracked or blocked with soot. Cheap, and it looks like a blocked DPF on a scan.
- Temperature sensors that read wrong, so the car never starts a regen.
- EGR and intake soot making the engine run rich, which fills the filter faster.
- A DPF that is actually full because the car has not had a motorway run in months.
Additives and “DPF deletes”
A bottle from the internet does not replace a completed regen. Removing the filter is illegal for road use in the UK and will fail an MOT on emissions and visual checks. We do not do deletes.
Should you keep the diesel?
If the car does 15 miles of dual carriageway regularly, a TDI is still a sensible motor. If it does two miles to school twice a day, the DPF will keep filling. That is use, not a conspiracy by Volkswagen.
Diagnostics first. See the servicing page for how we quote. Do not buy a new DPF off an advert before someone has looked at the sensors.