Hi Willard, thanks for saving me £170 plus vat! However, when you remove the panel beneath the glove compartment (2.06 in) you say it just snaps off. I have a 2017 W213 and there is one screw in the underside closest to the door. Word of warning to anyone else. Check for screws people! Thanks again for a very clear instructional video. I did it in 20 mins!

To be clear it is simply replacing the auxiliary battery rather than fixing it. The position is the same for C class and E class and if you are in the UK it is in the same place but on the other side. They seem to last about 6-7 years. They car seems to reset itself OK and you can do it all while it is live (but not running of course!) This is a nice clear demo of how to get to the part.

The video makes it look easy…But wait! There’s more to it. Getting to the auxiliary voltage regulator is not easy for a novice. The carpet is molded with a rigid foam backing and it is not easy to get out of the way. Then when the new part is replaced the electrical system is interrupted and a new code appears on the dashboard. The auxiliary malfunction code goes away but a new code appeared. I thought I would have to take the car in to a Mercedes shop to get the new electrical code erased, however after driving a few miles the “start engine/see operator’s manual” code went away. What an adventure. I guess the money saved makes it worthwhile.

Thank you for your detailed procedure posting. Precisely what I have been searching for. Appreciated.

thank you so much for the very informative and step by step . you are the best, thank you

Thank you so much for making this video, lovely clear instructions. I am definately not a car mechanic and I have managed to find and replace my converter, so thank you for your help.

Thank you for your video. It took me 30min. Job done money saved. Mercedes e220 coupe 2017

Thank you so much It’s super easy when i know😅✌️🙏

Hi, Would the E350e Hybrid 2017 be the same? Auxiliary battery malfunction light comes up sometimes. Thank you

Great Video Man! Aprreciated

Great Video Thanks

Still after changing that converter I'm facing same fault

I have a voltage fluctuation problem just replaced the main battery that didn’t fix it .. was thinking to change this auxiliary

can anyone tell where the aux. battery is located on a MB E400 coupe, its not in the well of drivers side like they show on vidoes

Do i need to disconnect main battery before doing this ?

Very good 👍

Thanks. Mine just failed at 44k miles

How much will this cost at a dealership?

Mercedes says the 17 e300 is in the trunk w a different part number

Mine has a screw holding the hush plate in place also.

Would you know the price?