I believe my 2008 Saab V6 Aero is missing a vacuum hose. While replacing the brake booster vacuum hose, I noticed the MAP sensor, (OEM part 0 261 230 101), has a nipple with an O-Ring for some type of connection however nothing is connected to the MAP sensor, (it is simply open to ambient air pressure). I assume there should be a hose connected between the MAP sensor and the intake manifold but I cannot find the location / port to which the MAP is to be connected. I've searched through some workshop diagrams and came away with nothing. Any help would be greatly appreciated.

 

Further investigation, (looking at the intake manifold parts diagram of the B284 engine), reveals this component, (OEM # 0 261 230 101) to be an "Atmospheric Pressure Sensor" not a MAP sensor. If this is fact, then there will be no hose connection. Why then does the sensor have an O-RING on the nipple as if it were to be a sealed connection? I suspect this sensor might be utilized in multiple applications and there for the O-RING is always included.