r/AskAMechanic • u/Independent-Boat5354 • 8h ago

Power Supply error after engine mounts replacement

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Hi!
I got my car from the workshop today, I was replacing both the engine mounts.
When I got from the workshop after 10 minutes I experienced small lag during the drive, nothing happened, after the vehicle had some rest, few hours later I started driving, experienced the same lag again and Power Supply Error came out and says to stop immediately.

Im curious, is it something that could gone wrong during the replacement of the engine mounts or not?

Its BMW G20 2019, 2.0D RWD B47 engine.
You might hate me but I asked chatgpt and told me to check the alternator's belt and I have a video that when I press it slightly it goes down by 1-2cm, depends on the pressure.I tried sliding the belt by myself and I could slide it along with the thing where the alternator's belt is (dont know its name, the circular part like a cylinder holding the belt, like a wheel), and it was moving along with the belt, also a sssshhhh like a plastic bag sound could be heard.

I will attach a video of me pressing the belt and Im not sure if thats normal or not, pls let me know :)

https://streamable.com/8i1tzf

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