I'm with Ant.
The reason that this DPF removal trade has taken off is because there is no licensing to prevent it.

It is illegal, it is dodgy & it is a pain in the arse to diagnose a vehicle thats had a frontal lobotomy performed on it by a remapper with little knowledge of the knock on effect of his work.

The Audi we had in was handed back to the owner with a suggestion of a new ECU and a DPF fitted for us to proceed to diagnose a vehicle which behaves normally not in some pscyzophrenic lobotomised manner which has it running in limp with no DTC's logged & PIDs missing.

The car which currently stands it's owner to the tune of £3000 of half arsed repair attempts has now gone to auction - coming to a workshop near you soon with no previous repair history.....How are you going to diagnose that?, you'll be 1 hour in before it starts to dawn on you that this is one sick automobile.

Roll on technician licensing