I actually just attempted it the other day...

You can sorta trace the wire back up. Its under the vanity cover that's on top of the valve cover. You'll have to remove that to get to it. All 4 of the connectors are under there.

I tried to do this when the engine was cold and that led to ntothing but frustration. In hindsight I remember doing one after I came home from work and let the car sit for about 2 hours. Still use some work gloves as you don't want to get burned.

Get the front end of the car as high up as you can. Taking off the right wheel will get you some extra space to work but not necessary. I say to get it up high because you'll likely want to get a longer ratchet for some extra torque & leverage.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean