To get to the ECM you need to take the top dash apart. First the plastic center piece than the two side pieces. Then there is a metal cover that needs to be unscrewed and the ECM is located under the drivers side panel. If you go in there you might as well change your Cabin Filter which is located under the passenger side Dash Panel. It will definitely need changing! Why do you think there is an issue with your Computer/ECM module?have a 1998 bettle. Where is the computer? i cant find it and i am having problems with it.