Air bag light on ,new battery needs charge after idle two days

Hi, If you have access to a VAG-com diagnostic system it might help, but it could be something very simple like a trunk or glove compartment light staying on due to a faulty switch.

If the car were mine I would remove the neg battery terminal and check with an ammeter to find out if there is any current being drawn when the car and all accessories are switched off.

If you don't want to be even that technical, stick a running camcorder in the trunk and glove compartments and close the doors for 20 seconds. Open the door and play back the video to see if the light went out...

Hope this helps you a bit. If it does, a "Fixya!" rating would be much appreciated. If it doesn't help you, I'd be grateful if you didn't bother with a rating at present - they can't be increased later if I do manage to solve your problem! Just come back and tell me what you found. Cheers, D