In my 1999 Audi A6 Quattro the BATTERY Went out

On the side of the transmission.

1999 Audi A6 Quattro 2.8 V6 engine

IMPORTANT NOTE: You must have the security anti-theft code for yours Audi Concert radio from the car manufacturer! For Audi Concert the sequence of programming is:
1. Push simultaneous "SCAN" and "RDS" keys until on the screen will appear "1000" displayed.
2. Release keys. No more push on "SCAN" and "RDS" keys because otherwise number "1000" will be considered as first safe code attempt.
3. By the #1 key you will set up the first safe code digit.
4. By the #2 key you will set up the second safe code digit.
5. By the #3 key you will set up the third safe code digit.
6. By the #4 key you will set up the four-th safe code digit.
7. Then push again simultaneous "SCAN" and "RDS" keys for confirm this safe code. On the screen will be displayed "SAFE" notice. Release keys! For few seconds a radio frequence will be displayed. The radio is now ready for use!

ALL 1999 Audi A6:
A6 Quattro Sedan
A6 Quattro Wagon
A6 Sedan
have the 2.8L DOHC V6

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

if you have the factory code card it is possible to change the code to one only known to you.the previous owner has not done you any favours as you need to have the radio recoded.see yellow pages.

Radio lock out codes are security related and where supplied with the original paper work when the car was delivered to the original owner to discourage theft, so they are not published on the web, if they were what would be the point? Any thief could get the code after stealing your radio.

Contact the dealer for instructions and what info u need to get your cars unique radio code. The dealer will require the serial number off the radio and proof of ownership of the car it came from.

Hope help with this.

whether you get your battery from walmart or a parts store they can look it up to get the right battery for your car

This is a manual transmission? If so the clutch probably needs to be replaced. When you say "VIOLENTLY" what is going on, what is the road speed, what are the RPMs at? The more specific information the better. And this problem ONLY occurs between gear changes, right? The other times, everything is normal?

Start your car, then unplug the battery. if it dies, your alternator may need to be checked at an automotive parts store for it may be bad. If it runs, your battery has a dead cell and needs to be replaced.

You have to bleed the system, most likely air, or you blew the fuel pump fuse !