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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.
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If your brake fluid is a little low, learn how to add some here. Ignoring a low level leads to big problems2004 Audi A6 3.0L V6
Dirty cabin air filter cause undue wear on your car's heater and AC and can cause bad odors2004 Audi A6 3.0L V6
Replacing a dirty air filter can improve gas mileage by up to 4%. Isn't efficiency great?2004 Audi A6 3.0L V6
Unlike a waist belt, these usually become looser as they age! Learn how to check it here2004 Audi A6 3.0L V6