I've got an Audi 80 1994 , automatic 2.6l, built in immobilizer and central locking ...
Ok here is the deal ... I get into the car put the key in, start the engine ... and some bizzare clicking noise starts (click ... click .... click ...) sounds like it's coming from the gearbox because I can clearly hear it inside. As soon as I touch the brakes clicking stops ...
Ok release the brake, clicking starts again ... I shift the gear to any speed ... it stops .. I am driving there is no clicking. I stop on a trafic light , put gear into neutral ...and when I press the brake there is a single click sound. So each time I press the brake I hear a single click , like a switch ... so it only does constant clicking in Park.
So I assume its somthing to do with automatic gearbox connecting to the engline and disconnecting.