Hi There Just Recently Bought A Audi A4 2.0 TDI 170 The DPF Light Has Come On A Few Times Before But After Taking On Motorway Has Gone Off Each Time But Yesterday I Did A 400 Mile Round Trip And Made Sure Near To End Of My Journey That I Kept The Revs High And Used Fifth Gear To Aid Passive Regeneration But To My Surprise The DPF Light Has Come On Again Today So Had To Take It On Motorway And Has Gone Off, Also Have Rough Idle Sometimes Which Makes The Car Shake (Just To Add I've Had The Egr Valve Replaced But Still The Same) Any Help Will Be Totally Appreciated
Thanks In Advance For All Replies