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Old 02-09-2017, 01:08 PM
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4WD, ABS, BRAKE, TIRE (Solved)

This is an extension of a post I added to another thread. I am putting it here because I was getting no traction on the other thread, and because I think my problem is different from what I first assumed.

I was coming into a shopping center and as I slowed I thought I heard a uncharacteristic whine from the transmission. I completed my shopping and then came out to the car (2006, 4.4i), as I started driving, I thought I heard a grinding or bad bearing noise coming from the underside. When I got home, I put away the groceries and took another short drive, This time I could not be sure if I heard the noise or not (if it was there, it was very faint).

Two days later, I get all the four lights mentioned in the title. When the lights come on, the car seems to drive smoother than when I hear/feel the slight grinding. I figured I probably had the trifecta problem and that the extra light was some kind of bonus. When shutting down the car, I never heard the clicking noise, but then I also read that that was not always present when the TCA gear is giving trouble.

Anyway, I removed the TCA, stripped it down* and found that there was very little wear on the gear (picture), certainly not enough to proclaim this as the problem.

So, today, I will put the TCA back in place with the new gear and go from there.
  1. Has anyone have any experience with all four lights mentioned?
  2. Does anyone have any advice as to where to look next in case the slight wear on the gear was not the problem?
  3. While the TCA is out, is there a way to do any test of the transfer case?
  4. Is there a test that can be performed on the sensor removed at he second wire harness connector?

After more investigation, it seems I should be looking at brake sensors. Any input would be appreciated.

*BTW, if you are trying to get the plate off, I fought with it for a long time, then put it into my oven for 15 minutes at 200 degrees - it then popped right off. Nothing seems to have suffered from the heat.
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2006 X5 Sport 4.4i

Last edited by blktoptrvl; 02-15-2017 at 04:09 PM. Reason: Resolution listed
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