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The video above shows you how to replace the battery in your 2009 Mercedes-Benz C300. We recommend changing the battery in Mercedes-Benzs 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 C300 that you need to replace.
Replacing the battery in your C300 involves removing the terminals. When you reconnect the terminals, your radio presets are likely to be cleared out. In some C300s, 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 Mercedes-Benz and they will give you the code for free. In many Mercedes-Benzs, 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.
If your car is leaking a small amount of power steering fluid - see this video on how to fix the leak2009 Mercedes-Benz C300 Sport 3.0L V6
On many cars, the high beam bulb runs at reduced power during the day - check 'em and change 'em!2009 Mercedes-Benz C300 Sport 3.0L V6
Learn where your spare tire and jack are located before you need it on the side of the road2009 Mercedes-Benz C300 Sport 3.0L V6
Learning how to jump your car before you need to is an excellent idea2009 Mercedes-Benz C300 Sport 3.0L V6
Don't be the guy with your third brake light burnt out2013 Mercedes-Benz C300 4Matic Sport 3.5L V6
The best way to fix leaking hoses is to replace them, but if you don't have time, a stop leak product might work for you2009 Mercedes-Benz C300 Sport 3.0L V6