One problem related to steering has been reported for the 1998 Audi A6. The most recently reported issues are listed below.
While driving 55mph steering wheel heat sensors caught on fire. Flames shot out towards driver's face. There was no prior warning. The flames were extinguished by driver's hands. Managed to pull vehicle over. Contacted Audi dealership. Turned heat sensors off on steering wheel. Took vehicle to dealership & mechanic replaced steering wheel without the heat sensors.