My mates just brought a MK4 GTI 2.0 got it for a good price from and aution just got a couple of niggly problems. The airbag light is on on the dash my mate had it on his S3 and it was the sensor under the seat is this a common problem. And the other thing is the front windows wont open and the interior light wont come on havent checked the fuses yet any ideas?