I know I found the info somewhere on a search, but cant seem to find it right now and I need to plug that damn sensor in the oil pan. Is it a m20x1.5 bolt?

 

I'm 99% sure your right its a m20 x 1.5 bolt. I'll verify it tomorrow for you as I'm missing my m20 x 1.5 tap. The sensor is bigger than m18 and smaller than m22 and I checked the thread pitch and it is 1.5 so unless they made a m19 or m21 its probably the m20 x 1.5. The popular pitch size for a m20 bolt is 2.5 so you might have trouble locating one unless you order one from an industrial fastener company like Fastenal or Mc master-Carr, Grainger etc.