98 Audi A6 Quattro need help!
 

So I’m having a issue. A bought a used Audi A6 from a guy and the car has sat for a year before i purchased it. I’m having a couple issues. First of all i have a air bag light on abs light and a blinking brake light. When i turn my headlights on brake light fail appears on the lcd. Also my scanner will not communicate with abs or srs or anything just the engine. I’m trying to figure all this out. The headlights are aftermarket. I have a aftermarket radio also. Professional installed. I know the abs module is bad and needs changed. Could that cause my scanner to have a linking issue?