I have a 2004 VW Golf and after I start the car my airbag light goes off for 3 seconds (like it is suppose to) but then it comes back on and stays on for no reason.
All I did I removed the driver seat to clean under the seat.NO idea what I did wrong.
Does anybody has any idea except for buying the reset tool to reset the airbag system?

 

Welcome to the forum Karl.

Well if all that you've done is remove the seat and put it back check all electrical connections as the air bag needs to know if someone is sitting in the seat before it deploys, well it does on newer models.