Diagnosing a DPF issue! We get so many customer DPF issues which has been to other garages and they have not been able to resolve the problem. It really isn't that difficult if you understand how the system works and have the right equipment to diagnose it properly. I see lots of changed parts including DPF's at a considerable cost when in fact it was only a £5 split pipe that was causing the problem 😳 If you are having DPF, EGR, Injector, Catalytic Converter or Emission issues then it is vital