Most old Audis have the CC working intermittenly, our 98 A8 also has the problem, we haven't had time to check into it since we don't use it so often. We accumulated all the links to websites that we stumbled into for our references.

1. Vacuum diagram
2. Resoldering caps on controller
3. Resoldering caps on controller2
4. Resoldering caps on the controller3
   
5. CC Diagnostic.
6. FAQ.
7. Vacuum Unit.
8. The best write up for fixing
   

We've had the A8 for almost 4 years and added 40k miles, it's been the most comfortable & reliable car we've ever had (and we have never taken it to the dealers or shops for anything except alignment & new tires). According to the ex-owner records, the spark plugs are...

FRONT BRAKE ROTORS & PADS 1998 A8 4.2L

Tools needed: 17mm socket for wheel lugs, 18mm socket for caliper frame, 7mm hex, screw driver, extension 3/8 or ½, long nose pliers, brake piston retract tool.

- Remove wheel lugs covers.
- Open the wheel lugs a few turns.
- Jack up the car and...

Well, our A8 has 159k miles now, and the freon doesn't hold any more, every year @ summer time, we have to take it to the shop to get freon charge and each time it's $70.00. Now we do it at home for $4.00.

The only way that you can charge Freon to any car is from the LOW port. You can do this with any car, but for the Audis,...

98 A8 from the original website

98 AUDI A8

This was the way I did mine, please use the below information as reference only and be safe. The upper Control arms start to loosen when my car hit 120k+, they make clunking noise when you back up while turning, and my car feels loose when you go over bumps....