Hi all. Newbie here. This might be a daft question, but here goes. Have an a4 convertible on a 52 plate and loving it, but multi function steering wheel controls are not working. Is it something I can sort out myself, and how, or do I need to take it to dealer? Oh, plus airbag light comes on after I have been driving for a while, then disappears once the engine has been switched off. Again, dealer? Any advice welcome. Thanks.