How do you reset the check engine light in an Audi B6?

Answer 1

You did not say what year it is. In general you can get an OBD reader that plugs into the port on the car and use that to reset the codes by erasing them, OR you can pull the fuse on the ECM or you can disconnect the battery. If the light does not go out when any of these are done then the issue that made the light come on is not corrected.