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This is the drive Axle that goes into your wheel hub to spin the wheels (some call it Axle shaft output, CV Axle etc). Behind those black rubber boots are bearings. Over time the rubber loses it's elasticity and tears. When that happens dirt and debris gets inside the bearings and damaging them. That's where the clicking comes from, at least in my case. What you need to do is lay under the car and check the shaft that goes into the wheel, you have one in each wheel since it's all wheel drive, unless you have SDrive which is only rear. If your rubber boot is torn you should be able to see black grease around that area. If that is the case you need to replace your drive Axle
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