When Should a DPF Not Be Cleaned?
We make our living cleaning DPFs, and some jobs we still turn away — because cleaning would be the wrong engineering answer. These are those cases.
01
The core is cracked or melted
Usually the aftermath of a runaway regeneration or repeated forced regens at very high soot load. Cleaning a cracked core gives you back a filter that leaks particulates past the crack — it will fail emissions and solve nothing. This needs replacement.
02
The filter has been gutted
If a previous owner had the core removed, there is nothing to clean. The fix is a new filter — and if the ECU was remapped to hide the deletion, that needs undoing too before the car will run right with one.
03
The engine fault hasn't been fixed
A turbo passing oil, leaking injector seals, a cracked EGR cooler — these contaminate the filter. We can clean the DPF today, but until the fault is repaired it will re-contaminate in weeks. Fix the cause first; then the clean is worth paying for. We'd rather tell you that than take the job twice.
04
The 'blockage' is a sensor fault
A differential-pressure sensor or its pipes can report a blocked filter that isn't. Cleaning a healthy DPF wastes your money — this is why codes like P2452/P2453 need the sensor circuit checked first.
05
Marginal soot on a healthy filter
A young, low-ash filter at moderate soot load often just needs a completed regeneration — a sustained motorway run or a controlled active regen. We'll say so rather than book it in.
Every unit we receive is inspected before any work. Unviable units are reported back with photos, free of charge. If yours is one of the good cases — and most are — see what cleaning costs or how cleaning works.