what can be wrong when the airbag sensor is on? I'm really interested in this A4 and ready to buy it but just want to know the price i have to pay to reapir it so i can bargain off the price to fix it. i saw the recalls for airbags for early a4 the one i want is a 1998 so it doesnt apply to it then right? Also my friend has a code reader can this tell the problem?