Hi mate,
Thanks for the quick response. Especially on Xmas day!
It's the Exhaust System light that flashes and some misfiring definitely occurs. If I drive normally for 5 mins or so, it disappears and the car drives as normal. However if I try to accelerate too sharply, the same problem occurs again and the light starts flashing.
According to the manual, I should drive slowly and take it to a dealer to investigate.
My GTI is an early 2005 model.
Apologies for my ignorance but what is the DV?
It could be related to the particular type of fuel I've used? The car has quite high mileage (>100K) and I'm wondering if a particular type of petrol has been used. Perhaps the change to BP Ultimate has caused the problem?