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What Does Auxiliary Battery Malfunction Mean On A Mercedes-Benz?

What Does Auxiliary Battery Malfunction Mean On A Mercedes-Benz
What is the Auxiliary Battery? – Every car, SUV and truck has a 12 volt battery for starting the engine. Since the mid-2000’s Mercedes has also installed a second battery. This is what they call the auxiliary battery and it’s just a smaller version of the main battery.

(To be accurate, in a few Mercedes-Benz models it’s actually a capacitor, which is another device for storing electricity.) The auxiliary battery is a backup for the main battery. It does a number of jobs depending on what model of car it’s installed in. These range from powering electrical accessories like the radio/infotainment to operating the engine stop-start system.

Like the main battery, the auxiliary battery is charged when the engine is running. And just like that battery, it lasts around four to six years. When it can’t hold a charge the computer pops up that malfunction message.
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What does auxiliary battery malfunction on my Mercedes mean?

How Does a Faulty Auxiliary Battery Affect My Vehicle’s Performance? – An auxiliary battery malfunction can cause your vehicle’s electrical systems and operations to display errors. These include your entertainment system, GPS, PDC sensors, radio, and start/stop functionality.

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You will start to notice vehicle safety features like Blind Spot Assist, Lane Keeping Assist, and similar lighting notifications fail to activate. An AUX battery light may also activate in your instrument cluster. Note, these are not critical components, so it won’t cause your vehicle not to start. However, they can affect your concentration on the road, especially if you are reliant on any of these helpful safety features like Lane Assist.

Imagine having to drive without your radio on during a long road trip? Your fellow passengers may not be able to forget it for months afterward.
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How much will it cost to replace my Mercedes Benz auxiliary battery?

Car Service Estimate
2020 Mercedes-Benz E350L4-2.0L Turbo Service typeAuxiliary Battery Replacement Estimate$619.99
2010 Mercedes-Benz E350V6-3.5L Service typeAuxiliary Battery Replacement Estimate$615.79
2011 Mercedes-Benz E350V6-3.5L Service typeAuxiliary Battery Replacement Estimate$615.79

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How long does a Mercedes auxiliary battery last?

What is the Auxiliary Battery? – Every car, SUV and truck has a 12 volt battery for starting the engine. Since the mid-2000’s Mercedes has also installed a second battery. This is what they call the auxiliary battery and it’s just a smaller version of the main battery.

  • To be accurate, in a few Mercedes-Benz models it’s actually a capacitor, which is another device for storing electricity.) The auxiliary battery is a backup for the main battery.
  • It does a number of jobs depending on what model of car it’s installed in.
  • These range from powering electrical accessories like the radio/infotainment to operating the engine stop-start system.
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Like the main battery, the auxiliary battery is charged when the engine is running. And just like that battery, it lasts around four to six years. When it can’t hold a charge the computer pops up that malfunction message.
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How long should my auxiliary battery last?

Most auxiliary batteries have a lifespan of between 5 to 8 years, but it could be more or less. Nonetheless, once your auxiliary battery declines, it will put a strain on the rest of your car. You may see accessories start to fail and problems with other car functions.
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Can I change Mercedes battery by myself?

For the DIY car enthusiast, battery replacement on a Mercedes-Benz is a fairly easy task to master. All you need is a replacement battery and a few basic tools. Beyond that, you need to locate where the battery is in the vehicle and know how to disconnect it to make way for the new one.
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How often do Mercedes batteries need to be replaced?

Are you wondering how often you need to replace a car battery? Service professionals will typically recommend that you replace your Mercedes-Benz car battery every 4-5 years. However, it’s important to note that there are other factors that can impact battery life and cause you to need to change your battery sooner.
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Can I drive with battery malfunction?

The Causes Of Battery Light? – A car battery light is an indicator light mounted on the car dashboard. Its mission is to inform you about the condition of your car battery. The abnormal condition may come from a crippled alternator belt, a battery cell run-down, or a defective alternator.
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How long does a car battery last on auxiliary battery?

Most auxiliary batteries have a lifespan of between 5 to 8 years, but it could be more or less. Nonetheless, once your auxiliary battery declines, it will put a strain on the rest of your car. You may see accessories start to fail and problems with other car functions.
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