Yep... thats gonna be the alternator. Unfortunately this happens to be one of the more difficult ones from BMW. It is at the bottom on the drivers side. It is a bitch to remove because you not only have to remove the fan w/shroud, but there is an idler pulley bolted to the alternator housing from behind that is in front of one of the alternator mounting bolts and is a pain to get off without swivel sockets and flex wrenches. And not to mention that since it's a water cooled alternator, you lose the engines coolant as soon as you pull it so have a big drain pan and some fresh coolant handy. Thinking about it, I don't see it being done without a rack to lift the vehicle.

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X5 pics

RIP 4.6is.....

2003 4.6is