Ok, the light is on again, and after a 7th regeneration, and a trip to the dealership, there appears to be a major break through. It seems that on the quiet Seat have issued a communication to branches advising that there is an injection fault, and although couldn't get a straight answer, this has been sending too much fuel, causing the fumes we could smell constantly, and having an impact on the way the engine works and the exhaust system, hence the overfilling of the DPF. So car booked in for repair under warranty, and hoping this will fix all the other problems too. A letter to Seat head office on its way for all the issues over the last 6 months, light at the end of the tunnel I hope........
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