A6 check engine

[Langley giles]

Im a neewbie..and my check engine lite ,came on..went off and I hit a certain speed and it came back on but was blinking this time

[Cockney Boy]

Is your car driving in limp mode? it maybe something as simple as the n75 valve (quite common) but the best option is to do a scan, many members on here use VCDS. If your near Buckinghamshire then you can pop to mine for it