Thanks everyone for all the replies. I'm back with a quick update, sorry it took a bit longer:

- The secundary airpump has been disconnected for a few weeks now and there is zero downside and have been no faults. No CEL either. Of course the car throws a faultcode when scanning with software, but that's not an issue. I doubt it will be an issue with the emision over here (Netherlands), but the next general inspection for my car is only in 12 months. I can always plug it back in if need be.
- I have manually bent back the metal part of the microswitch of my driverside mirror, and so far it's kept up great. When I try to fold the mirrors it works 4/5 times. Sometimes they do nothing at all, and other times they keep unfolding automatically. But the next day it just works again. Not sure what to think of this. If it gets worse I will buy the replacement as suggested by @wpoll, thanks for the links!


Of course a new issue has come up in the meantime. On my old X5 (3.0i), the driver side door stopped working because the previous owner pulled the door handle the wrong way. This has seemingly now also started on my new 4.6is when I pulled the doorhandle while it was frozen shut. It was 6 below 0 Celcius that night. Whenever I now pull the door (even when it's not frozen), it seems to push the window a little bit as well..

I'm afraid the handle broke on the inside, again. However if I pull really hard and abrupt, the door still opens. For now, at least

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2002 BMW E53 4.6is - Estoril blue
1984 BMW E30 325 - Zinnoberrot
1964 Chevrolet Chevelle 300 - Meadow green