One problem related to horn assembly has been reported for the 2001 Volkswagen GTI. The most recently reported issues are listed below.
Vehicle is in shop for replacement of catalytic converter and mass air flow sensor, both still under warranty because they are emission control. The culprit for the failure seems to be the coil pack has failed. The coil is not covered under warranty as the car now has 43,000 miles and is outside of warranty, cost is about $800. The coil pack failed and was replaced at 19,000 miles under warranty. Was told by dealer to expect to replace the coil about every 2 years. In addition had the drivers window clips fail twice and the window fell into the door, horn shorted 3 seperate times, the dealer finally replaced the relay the 3rd time it came in and that corrected it.