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i tried prying out the old speed sensor today and, of course, it was bonded into the cast housing and broke all to pieces and I ended up carving it out and picking up a new speed sensor that didn't make a difference. Apparently in the wheel baring, there is a magnet the speed sensor picks up instead of gears. I'll check around the reservoir tomorrow. THis is so frustrating. I did replace the brake light bulb though so that's one less thing at least...

The magnet is in the sensor. The ring in the bearing is just thinner and thicker steel. The interaction makes a ripple in the magnetic field which changes the sensor output.

It takes a tiny amount of rust to throw these things off or a tiny misalignment. Are you sure you are working on the right sensor? also what errors are you getting and what do you see for wheel speed ? Do you have a scanner that reads wheel speed? If not, get one. It's silly to fly blind when repairing.

I'll definitely look into that. In the meantime I've ordered a new sensor off Rock Auto so it should be here this week. Also, I scored a whole ABS module from a wrecker this weekend so, if it ends up being that, at least I have one to replace it with. I'm running out of fall days and will definitely need my ABS and traction control soon...

Good job on the module because off its not a sensor or feels like the module


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IT FIXED!!!!

It was a busy two days of working on it; yesterday I pulled the headlight out so I could work around the ABS module. I pulled it out thinking I'd just swap it with the one I got from the wrecker but after following the one Youtube video, draining my rad, moving hoses to gain access to the module and removing it, I watched another video only to find that they are vehicle specific and needed to be rebuilt in order to work properly; or so they said...


I google searched for a shop that rebuilds them and came across a Formula Auto Service in Calgary, AB. I talked to Eugene who was super helpful and he told me to put my old one in so he could pull up the codes and go from there so I re-installed my module leaving my headlight out and went to see him this morning. The codes told him it was the pressure sensor so I went home and swapped out the sensor (on the back of the aluminum block with all the lines going into it). I was narrowly able to access it from the top between the power steering reservoir and the oil filter with ha 24mm wrench moving it mm by mm. I got it out, swapped it quickly with the one from the wrecker (not to lose too much brake fluid) and headed back to Eugene's shop to hopefully cancel the codes and call it fixed but the codes still came up so he sent me home again to swap out the control module (black plastic housing). Without draining the coolant this time, I managed to loosen all 6 torque bolts from the ABS module, swap it with the wrecker one and headed back to cancel codes. SUCCESS!! He had to do something with his scanner so the X5 would accept the newer one but it worked and I'm happy to have traction control and ABS back!!!



Side Note: I had no idea till today that when BMW came out with the 4.6is they used the Alpina B10 engine out of the 5series. I thought that was pretty cool!!

Anyways, i hope someone on here can learn something from this adventure and thanks for all your help also. :thumbup:

Updating...it's not a smart move to spend $658 to trace the broken ABS wire issues from BMW dealer. And the estimated price to replace ABS module is about $2700. So I was going to do it myself. Then I spent $274 to replace it with a rebuilt ABS module from ebay vendor and coded it with NCS Experts. It's pretty easy to do it myself.