u/Donkey_kong_08765

Hi Guys so I bought an m140i about 3 months ago and had a service last week. But I’ve noticed now everytime I turn the car on there’s a screech coming from the engine bay for a split second. And every time the car changes gear, I can hear the screech quite subtly.

Anyone can enlighten me on what the issue is? This noise wasn’t there before the service btw (oil and filter)