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The video above shows you how to replace the battery in your 2004 Audi A6. We recommend changing the battery in Audis every 4 years. Although some batteries last much longer, most batteries begin breaking down chemically after four years, so you could experience dimmer headlights and other negative effects before you have a dead battery in your A6 that you need to replace.
Replacing the battery in your A6 involves removing the terminals. When you reconnect the terminals, your radio presets are likely to be cleared out. In some A6s, you may need to re-enter a security code to get your radio to work again. Check for this code in your owners manual - it will usually be either a sticker or small card in the booklet. If you can't find it, call Audi and they will give you the code for free. In many Audis, the transmission "learns" how you drive over time and makes adjustments, so you may experience altered driving dynamics as your car re-learns your driving style after changing the battery.
Many cars will burn or leak a little bit of oil. Over time, this adds up and you might need to add some - learn how to here!2004 Audi A6 3.0L V6
See how to seal up minor power steering fluid leaks2004 Audi A6 3.0L V6
Don't send mixed signals - if your turn signal doesn't blink, or blinks rapidly, you likely have a burnt out bulb2004 Audi A6 3.0L V6
If your battery has green or white cruddy deposits, it is probably not getting enough juice from and will likely wear out sooner2004 Audi A6 3.0L V6
Leaking coolant is usually a sign that your water pump needs to be replaced. This video shows you how to quickly plug it2004 Audi A6 3.0L V6
If your car is leaking a small amount of power steering fluid - see this video on how to fix the leak2004 Audi A6 3.0L V6