Has anybody experienced intermittent speedo failure combined with the appearance of the ABS and ESP (Exclamation mark in triangle/circle) amber warning lights whilst driving? The problem appears to rectify when the ignition is turned off and then turned back on again but soon returns. It's an A4 Avant 1.9 TD 2003. There doesn't appear to be any other symptoms and I'm scratching my head??? Any advice would be greatly appreciated.