To the car mechanics, what is this?

I recently gave my BMW 3 Series E90 to my stepfather for an oil change. He noticed that a cable wasn't connected. We don't know what it is. He said it might be a compressor for the air suspension or something similar. Does anyone know what this is?

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migebuff
2 years ago

Looks like the vacuum hose for the motor bearings.

Ghostdying
2 years ago

The oil pan.