2014 E Class auxillary battery malfunction

Asked by Caliber_9026 Feb 01, 2017 at 05:42 PM about the 2014 Mercedes-Benz E-Class E 350 Luxury 4MATIC

Question type: Maintenance & Repair

I had a product called eco off installed to disable the eco on/off feature.  After a
few weeks the auxiliary battery malfunction warning is displayed on each start
up, any connection?

1 Answer
16,025

bobkat answered 7 years ago

MB's can be really finicky when anything is changed in their electrical system. Check the wiring of your Eco add-on. You may need to change the points where it is wired into.

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