I am totally new to this forum but have been reading it for a while for other issues which have helped massively.
I appear to have a problem with the Emission Control System and the car going into Limp Mode. Last weekend we were heading to Silverstone and after reaching about 80mph the car went into limp mode and the ECS light went on... When restarting it everything was okay but the ECS light stayed on. The car is a A3, 2.0 TDI 05 Reg Automatic.
We bought the car mid July and all seemed okay - took it for a health check and they reported back with a Error Code of P0234 for air pressure control limit and marked as sporadic. They also said the turbo was a little noisy but nothing to really be worried about. The garage I went to seemed to be all clued up and said they were audi specialists. At this stage no warning lights have been coming on - the ECS light would flash for a 2 seconds when starting the car but that is about it. They said it wasn't a massive thing and could be looked into more when we got a few bit replaced (back wiper motor and front water jet nozzle)
Now - I am not too sure if this will have caused the issue but before we left for Silverstone the OH had put in 3 diesel fuel additives. He put in (all Forte brands) Advanced Formula Car Diesel Fuel Treatment, DPF Cleaner and Regenerator and Forte Diesel Turbo Cleaner. After this happened I spent a bit more time reading up and I don't think my car has a DPF filter on it - will this have caused the issue?
The car seems to be running okay but I have noticed that the diesel is not lasting as long as it normally would. It hasn't gone into limp mode since this happened but I generally do 20 miles a day driving to work and back.
Any advice/help would be appreciated!