Hi - I seem to be having the very common problem with my A4 avant tdi 170 late 2008 (new shape) that many members have had with their DPF. I have owned the car for 2.5yrs - Audi serviced. The DPF first came on in January and I managed to force a regen by driving up and down the M1. The light came on again a few days ago - the car also went into limp mode - so I had 3 lights on altogether. The DPF, the coil/wire one and the emissions control light. After a much longer stint on the motorway and high revs when not, both the DPF and the coil/wire lights have gone off - the car is no long in limp mode (that happened first) BUT I do still have the emissions control light on. Do I need to continue trying to force a regen - or has the DPF gone so far I will need to take it in for a 'clean out'? any advice appreciated. I'm in Halifax. thanks!