This guide provides instructions on how to replace the auxiliary battery from 2003 through 2009 Mercedes-Benz E-Class W211 vehicles such as E320, E350, E500, E55 AMG, E63 AMG. 

Symptoms

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

What you will need

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. w211 auxilary battery location
  3. Remove the 10 mm nut from the top bracket. Lift up the bracket. w211 e class aux battery bracket
  4. Remove the 10mm bolt from the negative battery terminal. neg positive  w211 aux battery
  5. Remove the 10mm bolt from the positive battery terminal. Be extremely careful so that the positive cable does not come in contact with any 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. w211 aux battery installed

 

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.

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Thank you! 

Visitor
Member since 2020-07

What's the model number for a axillary battery for 2003 e320

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Visitor
Member since 2020-07

My local shop wanted $195 to replace the auxiliary battery on my 2005 E500. This is so easy I plan on doing it myself.

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Visitor
Member since 2020-07

Very good step by step guide. Thanks for sharing.

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Mercedes-Benz E-Class W211 Auxiliary Battery Replacement This guide provides instructions on how to replace the auxiliary battery from 2003 through 2009 Mercedes-Benz E-Class W211 vehicles such as E320, E350, E500, E55 AMG, E63 AMG.