New to me 4.4L

[RuskiE39]

Hey everyone! Just thought I'd introduce my new to me 2002 X5 with the 4.4 engine. I stumbled across it in the dark corner of Craigslist where pictures and details are non-existent. Well, turns out, after several flaked appointments to see the car that it was a solid car and in pretty decent condition. It only has 130K which is pretty good for its age, I also got it for a steal of a price so very happy with that.

Anyways, I have a few problems that i'd like to address... The main purpose of the car is to be a spare, back-up, emergency, hauler, 4x4er, bad weather, long trip car and not intended for daily driving. So here are some of my concerns that i'd like to address:

1) There is a tamper dot on the cluster... now hold up, I know what you are thinking... but I am confident there was no malice behind this, ie; carfax and title show correct mileage. The car also has the ABS light and DSC Triangle light lit up permanently. I found some receipts in the car that show a diagnosis of failed speed sensors. ABS codes 30, 31, 32. My plan is to clean all of the speed sensors and if that fails, replace them. The car has brand new rotors and pads, and in the past I have seen that shavings from rotors have caused the fragments to stick to the sensors causing the light.

2) When I got the car all the windows worked... except the passenger door. No power at all, no locks, no window movement from either switch. I replaced the fuse in the glove box, and voila! The window works... but ONLY from the passenger switch. So what are we looking at here? Faulty master switch and a bad door lock actuator? I've also noted that I have to hold the button for the window to move, it will not roll up or down by itself with one click.

I will check the door loom wiring in the passenger door and also the master switch, these seem to have common faults and wiring coming loose.

3) There is a strange rattle/knocking noise coming from the trunk area, sounds like its coming from the taillight hatch area. I've done some research on this and it appears that this is a very common issue being either the rear seat or the bump stops on the hatch. I have so far ruled out it being the seat and will report back if the bump stops resolve the issue.

UPDATE: Rattle solved by adjusting the lift gate bump stops.

All in all, I have so far replaced the battery in the remote and got the key to work, and polished up the headlights since they were very badly oxidized. I've ordered a new chain tensioner and will have that installed over the weekend. Had some spare LED bulbs laying around so I now have LED license plate lights. Surprised to say that there is not a single leak, no coolant, power steering, oil leakage, or even cluster warnings. So far so good!

Here's a quick pic:
(Black interior)



If anyone has any ideas on my woes, more particularly the electrical gremlins, i'd appreciate your input. Thanks a lot!