Mercedes-Benz E-Class W211 Auxiliary Battery Replacement

Is there an Auxiliary Battery Malfunction appearing on your Mercedes-Benz dashboard? Learn how to fix the problem by replacing the auxiliary battery of your Mercedes-Benz. This guide provides instructions on replacing the auxiliary battery from 2003 through 2009 Mercedes-Benz E-Class W211 vehicles such as E320, E350, E500, E55 AMG, and E63 AMG.

Symptoms

• Auxiliary battery malfunction on the dashboard
• Battery protection: Convenience functions are temporarily unavailable

What you will need

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• W211 Auxilary Battery
• 10mm deep socket
• Ratchet wrench
• Battery Terminal Protector

Procedure

1. Open the hood and locate the auxiliary battery on the passenger side of the engine bay.
2. Remove the 10mm plastic nut from the cabin filter housing. 
3. Remove the 10 mm nut from the top bracket. Lift the bracket. 
4. Remove the 10mm bolt from the negative battery terminal. 
5. Remove the 10mm bolt from the positive battery terminal. Be extremely careful so that the positive cable does not come in contact with metal parts.
6. Remove the old battery and place the new battery in place. Connect the positive cable first. Connect the negative cable last. Spray battery terminal protector on the battery post to prevent corrosion. Install the cabin filter lid. 

No programming or coding is required. Once you replace the auxiliary battery on your W211 E-Class, the warning message should disappear from the dashboard.

We hope you find the Mercedes-Benz E-Class W211 Auxiliary Battery Replacement guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.