[Mercedes] Duplicating a key for a 2015 ML 250

[Randy Bennell]

Friends had an E430 4Matic a few years ago. She was bumped from behind 
at a traffic light hard enough to set off the seatbelt tighteners. The 
dealer didn't stock them and they were unable to drive the car for quite 
a while before the parts came in.

Randy




On 05/12/2025 10:34 AM, Allan Streib via Mercedes wrote:
> Was just reading about newer BMW EVs. Apparently EVs have a pyrotechnic fuse that fires upon detecting a collsion, like an airbag does. When this fuse blows it disconnects the high-voltage battery, which I guess makes sense.
>
> Problem is replacing it. While it's technically a replacable part, it's inside a fully-welded assembly. Also replacing it involves reflashing the computers, with a risk for bricking them if a complicated and exacting series of steps is not followed. And there are several other expensive landmines that can be stepped upon.
>
> All in all it's about a $5,000 job to replace that fuse plus the shop needs to spend about $25,000 on diagnostic systems to be able to reset everything properly. That's on top of any collision damage, so anything that triggers that fuse likely totals the car.
>
> The article uses BMW as an example but implies this is a problem with European cars in general, so I assume new MB models might have similar concerns.
>
> https://evclinic.eu/2025/12/04/2021-phev-bmw-ibmucp-21f37e-post-crash-recovery-when-eu-engineering-becomes-a-synonym-for-unrepairable-generating-waste/
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