cheerful

Hi,

This just showed up today. Tried to turn off engine and back on, or wait 30 min in between. The message appeared to be persistent.

Plugged in Autel OBD II Code Reader. Scan showed no code.

I searched a bit. Folks good at car themselves seem to have ways to fix it. But I can't find one with clear instruction on how to troubleshoot for someone who are not familiar with auto works.

The search seems to suggest this may go away and it's still OK to drive. Is that the case?

If I have to take to repair, do I have to go to dealer? Or any shop that can handle MB? Any suggestion on how much it would cost me?

Thanks

Andy74

Very common issue. You basically need to change ur auxiliary battery. Any qualified mechanic can do it. Actually some guys do it themselves. I recommend you use oem auxiliary battery as i noticed some guys used an aftermarket one but the message still pops up on their screen. One idea is to give your dealer a call see how much is it. See this video maybe you you can DIY and save $$$.

You Tube

cheerful

Thanks for the video. Looks like something beyond my skill set

Where can I buy OEM battery? Does it have to the dealer?

Thanks

cheerful

And another question: what's the aux battery for? Is the car still safe to drive?

Thanks

Andy74

Your dealer is one option. Other option is online. For example Ebay. Have a look:

https://www.ebay.com/itm/373139497581

Andy74

Well the car will drive as if nothing wrong with it but at the end of the day this battery well its not an actual battery its a voltage regulator and has a specific function. To see what it has have a look on the item description of the Ebay item I gave you earlier.
https://www.ebay.com/itm/373139497581

cheerful

The earliest appointment at the dealer is 3 weeks away. Is it safe to drive that long? It won't be much at this time of year so a few hundred miles.

Andy74

Independent mechanic?

cheerful

I have contacted more than 5 mechanic. None of them know specifically about it. It would need to go by the video you posted. So I'm a bit unsure if they can do it correctly.

Andy74

I would have done it myself. It doesn't seem to be that hard.
https://youtu.be/qiLLqjqyNoM

cheerful

I found a dealer further out and replaced it. Part is 150. Labor is 200.

Andy74

Well done.