Audi A5 tdi 2017, the amber check engine light returns after about 180 miles following regen and code p200 p200 cleared. Car divers well with no other issues does anyone have any ideas regarding this issue? It’s booked in to an authorised mechanic 23/4 who will carry out a full diagnostic and fix what’s required as it under warranty I’m just bit frustrated to know what the issue is 

Probably blocked EGR valve. Code is P2002. If it’s under warranty, I’m assuming this is not main dealer but independent garage. Blocked EGR valve not necessarily reflective of previous owner, but start stop short run journeys won’t have helped. If EGR doesn’t sort it, then you might need DPF flushed. Full VCDS scan will reveal more as it could be a DPF pressure sensor or blocked AdBlue injector. To be honest I’d investigate further and check air intake manifold. The garage in question will need to spend a little time on labour and a gasket, but that’s belt and braces approach.

Edited April 12, 20251 yr by spartacus 68

Thanks I’ll revert once I get the car back from the garage and let you all know hat the issue was and how it got resolved 

So diagnostic showed an issue with the DPF unit the dealer arranged for this to be replaced at no cost to me  I had a chat with the mechanic who showed me the old unit explained how it works and said it took him an age to remove due to the build up of hardened residue so problem solved for P2002 let’s hope I have no more problems