Sensor, not filter
A drifting pressure sensor tells the ECU the filter is blocked when it is not.
DPF & GPF · Daventry
DPF & GPF solutions in Daventry.
DPF trouble, solved properly.
Blocked diesel particulate filters diagnosed to the actual cause — plus dedicated DPF and GPF solutions for vehicles used exclusively in motorsport and off-road applications.
Diagnose first
always
DPF · FAP · GPF
diesel & petrol
Track & off-road
solutions
DPF & GPF solutions
A blocked DPF is a symptom, not the fault
A particulate filter only blocks when something stops it regenerating: short journeys that never get it hot, a lazy differential pressure sensor, a leaking injector, an EGR valve stuck open, a failing glow system, or a car that has been quietly aborting its regenerations for months. Replacing the filter without finding that reason buys you a very expensive repeat.
We read the regeneration history, the soot and ash load, exhaust temperatures and the pressure sensor's own plausibility, then tell you which of those it actually is. Very often the fix is one sensor or one leaking component, and the filter recovers on a forced regeneration.
For competition and off-road vehicles — track cars, agricultural and plant machinery, export builds — we also provide full DPF and GPF solutions, written and tested the same way as every other file we ship, with the original calibration saved first.
KESS3 · K-TAGGenuine tools, genuine files
Road-use notice: removing or defeating a DPF/GPF on a vehicle used on public roads is illegal in the UK and an automatic MOT failure. DPF and GPF solutions are supplied strictly for vehicles used exclusively for motorsport or off-road purposes. For road cars we diagnose and repair the cause.
At a glance
- Regeneration history and soot/ash load read properly
- Differential pressure sensor and EGR checked, not guessed
- Forced regeneration where the filter is still viable
- Honest verdict when a filter is genuinely finished
- Motorsport & off-road DPF/GPF solutions available
The result
What we find, week in week out
Regens never finishing
Short journeys or an aborted cycle — fixable with habits and a forced regen.
An upstream cause
EGR, injectors or turbo issues loading the filter far faster than design.
Genuinely blocked
When ash load is at the limit, no software fixes it — we tell you straight.
How it works
Three steps. One visit.
- 1
Book diagnostics
Bring the symptoms — warning light, limp mode, smell, poor economy.
- 2
We read the truth
Regen history, soot vs ash, sensor plausibility, exhaust temperatures.
- 3
You choose
Repair with a clear quote, or a motorsport/off-road solution for a qualifying vehicle.
Good to know
Questions we hear every week.
Can you remove the DPF from my road car?
No — on a road-registered vehicle that is illegal in the UK and an automatic MOT failure. We diagnose why it is blocking and repair the cause, which is usually cheaper than owners fear.
My DPF light keeps coming back after a forced regen. Why?
Because the regeneration treated the symptom. Something is loading the filter faster than it can burn off, or the car is aborting regens. That cause is visible in live data.
Is a DPF clean worth it?
Sometimes — if soot load is high but ash load is still low, cleaning plus fixing the underlying fault can restore the filter. If ash is at the limit, cleaning is money wasted.
Do you handle petrol GPF/OPF as well?
Yes. Petrol particulate filters are becoming the same story on newer cars, and the diagnostic approach is the same.
Find out what is actually wrong.
Book a diagnostic slot in the live diary and get the honest picture before you spend anything.
Book your slot