Just wanted to let you know that CELs can also be reset by disconnecting the battery for about 30 minutes. If you have a VW factory radio in your car, however, you'll need the factory codes to reset the stereo if you disconnect the battery for an exented period of time like that.....those codes should be written down somewhere in the documentation that came with the car. Autozone and Advanced Auto Parts is your best bet if you don't have the codes.