Recently purchased a 2000 A6. Abs light is on with no codes. Any ideas?

 

yeah my abs light is on also. but when i moved my stearing wheel wouldnt turn and the car shut off

 

hi guys, really big problem with the abs light and esp ....changed the brake light switch ,,but got the message
0145- Brake pressure Sensor G201


What to do guys,,,in big trouble here.....the car is jammed and the problem is intermittent......please help me out....