Shifting issues due to internal problems in high mileage automatic transmissions can be difficult to resolve without transmission replacement.Google+
Car Problem Reports
Volkswagen Cabrio High Mileage Automatic Transmissions May Have Shifting Problems
Volkswagen Cabrio Problem
Average Mileage: 131,000 mi (110,000 mi - 160,000 mi)
Visitor, 1999 Volkswagen Cabrio, 126,000 mi
rpm's go to 3000/3500 before shifting, hesitates a lot!
Car is in park but the dash shows it in drive. Even when I shift to other gears, the dash reads that it is in drive. Therefore the car will not start.
One thing that seemed to help was "resetting" the transmission (there is a feature that recognizes driver preferences and modifies shifting accordingly). When the car is off, turn the ignition so that the car has electrical power, but isn't running. Depress the accelerator all the way to the floor for a count of 30 seconds (you will feel a button under there). That's it. It wasn't exactly a magical fix, but I did notice a change. Adding transmission fluid (I had a slight leak) also helped.
Visitor, 1999 Volkswagen Cabrio, 160,000 mi
rpms go up to 4000 before shifting
RPMs go to 30, only at 20 mph