I am grateful for all the practical help and advice on here! I recently had ABS, ESP and flashing glow plug lights with no brake lights. This was cured by fitting a new brake light switch. Since then I have an intermittent problem with the ABS and ESP lights coming on when I brake and remaining on until the car is turned off and on. I took the car (2003 A6 Avant 1.9 Tdi) to local specialists today. The VAG reader came up with Brake Pressure Sensor 1 G201 01435 They suggested this could be a new ABS control unit at over £1000. I'm hoping it could be something simpler. Could it be connected to the new brake switch? Is this worth changing? Any suggestions will be gratefully received!