The 2014 Mercedes C250 auxiliary battery is located under the cabin air filter housing. You can locate the cabin air filter housing to the left of the engine bay. The main function of the Mercedes-Benz auxiliary battery is to provide voltage to the "stop-start" function. The auxiliary battery is also used to help run the accessories of Your car. If Your car has been starting fine but You keep on getting the red warning on Your instrument cluster that shows You a symbol of the battery then Your auxiliary 12-volt battery may need to be replaced. You can go with the OEM Mercedes-Benz Auxiliary battery or You could go with a more cost-effective alternative that meets the specifications.
Steven
March 13, 2021
On my 2014 Mercedes C250 it is Located in the Passenger Footwell. Pull the Carpet back and it will be on Top of the Diagonal Fusebox.
Matthew K
July 16, 2020
The auxiliary battery in the 2014 mercedes c250 is on top of the footwell on the passenger side. Plastic molding and carpet in the area will need to be removed to access it.
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