Hood pressure sensor? (changing microfilters)

I'm changing my e60 microfilters. The one one the driver's side is easy and already done. However the passenger side one is frustrating me. I'm stuck on removing the pressure sensor. I'm sure I'm doing something wrong but can't figure it out :dunno:

I'm putting my fingers on both sides of it...

vestuvines sukneles nuotraukos nuotakos puokstes