Multiple fault codes randomly appeared, Aux battery?

[Ravs88]

Hi all
This evening four error codes randomly appeared on the dash.
Just a bit of background, car is a c220 cdi, 75k on the clock, it's regularly driven on the motorway. In recent months the start/stop hasn't worked which I ignored. I've heard the stop start is based of the Aux battery and if that is out then you may receive multiple electric problems/fault messages, am I on the right tracks!? I don't see the main battery or Aux battery being changed from the service history of the car so my only thoughts are one of these

See attached images, what could possibly be the issue?
Thanks for reading
Ravs

 

[Gazwould]

Main battery is weak .

Nothing to do with auxiliary battery as I've removed mine and all it does is over the moon , delightfully , happy as Larry , permanently disable Stop Strain .

 

[Ravs88]

Main battery is weak .

Nothing to do with auxiliary battery as I've removed mine and all it does is over the moon , delightfully , happy as Larry , permanently disable Stop Strain .

Thank you very much for the swift reply.

I hope its as simple as this, as batteries are relatively easy and cheap to replace

 

[GeorgeR]

Hi all
This evening four error codes randomly appeared on the dash.
Just a bit of background, car is a c220 cdi, 75k on the clock, it's regularly driven on the motorway. In recent months the start/stop hasn't worked which I ignored. I've heard the stop start is based of the Aux battery and if that is out then you may receive multiple electric problems/fault messages, am I on the right tracks!? I don't see the main battery or Aux battery being changed from the service history of the car so my only thoughts are one of these

See attached images, what could possibly be the issue?
Thanks for reading
Ravs

The airbag has nothing to do with the AUX battery for sure. On the other hand, the fluctuation of the main voltage of the car can cause such issues. It needs a Star Diag to get to the bottom of it.

 

[tombell]

Had a similar problem with 2012 E220. Mech told me to undo the earth from the aux battery for a few minutes. Connected it back on. All ok