I had to replace the head on my R56S hardtop. I have it all back together, except for the following.

There are two plugs that can plug into the intake VANOS sensor. One is blue and the other is gray. Two questions:

1. Which one goes into the intake VANOS sensor?
2. Where does the other one go?

I have no idea where the other plug came from. There is nowhere that doesn't have a plug in it.

 

Thanks for all of the responses!! I got it fixed. Just for future reference, one goes to the tank vent, the other to the vanos solenoid. You can tell them apart by looking to see which of them is in the harness that plugs into the intake sensor on the back of the intake (not the bottom). That one goes to the vanos solenoid.