Hi All good evening. Hoping for some pointers. Have recently purchased an 07 A4 2.0Tdi b7 135000 miles. Runs well, smooth, pull like a train great on fuel etc. DPF light has come on so have done the motorway run....twice added dpf cleaner to fuel etc and light went out.
25 miles later light came back on.
I may add absolutely no loss of power or limp mode etc. Quit a lot of.black smoke when you give it the beans.
No dtc codes
Amy pointers on what may be the issue,
Thanksn