Merlin1

Could someone tell what this error message on dash means "Auxiliary Battery Malfunction"
Thanks

Plutoe

Yep, replace the aux battery and get on with your life!!

Merlin1

Yes obviously, but what is the Aux Battery for and where is it?

Plutoe

https://www.reference.com/technology...9ae23ddef70d60

Plutoe

You gotta get off the couch and search!!

Merlin1

Already searched but results are too general and not specific to W205.
So where is this battery located?

Plutoe

Please correct your post 3 to reflect what you are specifically looking for

christyan78

My car didn't run for a while as i have a second car.It is winter here,so very cold and a few days ago i started the engine to get it running from time to time.
At start i got the same message but while running the engine the warning disappeared.
I did a search on the web and looks like the w205 doesn't have an auxiliary battery so the warning could be caused by other things.
There's a topic https://mbworld.org/forums/c-class-w205/633845-auxiliary-battery-malfunction.html

Merlin1

Thanks, had already seen that post, not sure if it's correct or not.
Fault message has gone from Red to White, whatever that means.

Merlin1

Aux battery dash message disappeared but took to dealers anyway. It appears the message means a capacitor associated stop start function faulty, they replaced capacitor.

DBOC205

Jooya

Please tell me where is this capacitor located? 😞

benzw205

Hello,

So finally, does the W205 have an auxiliary battery ?

How much does it cost ?

Thank you.

dieseldoc

No battery. Has a capacitor/voltage converter
Part number2059053414

Rummy993

Located behind fake floor on pass front carpet.

ManiacGT

could you perhaps find a few more posts to duplicate the question in and irritate everyone just that bit further?

dieseldoc

Agree, quite annoying. Especially when the answer is already in the thread!