I got the four beeps warning when I started the car this morning, I have started the car a few times since without any beeps. Searching on this fantastic forum it sounds like the alarm siren battery backup is the issue. I've seen a few posts in the A3 forum suggesting a new unit from Audi is something like £183! and also seen a very good "how to" convert the existing unit to normal AA batteries. A few questions:- 1. What are the consequences of ignoring it? Does it link to the immobiliser and will it stop me from starting the car at some point? 2. I dont trust myself (or have the time) to replace the unit myself, has anyone had this replaced by an indi/dealer and if so what was the total cost? I understand that labour rates vary but a ball-park number would help me decide how I prioritise other work on the car. Thanks in advance.