DSC 4x4, Brake, and ABS Lights

[powell.guy2]

Hey guys,

A few weeks ago I went and got an oil change on my 2006 x5 4.4i. Everything was fine for a day. Then when I got home the next day I noticed a series of loud audible clicks directly after I shut the car off. Did some research and was led toward hydraulic lifters? But couldn't get anything looked at immediately due to school and kids. After about a week of that I was driving the car home and while starting to go at a green light i got the DSC 4x4 inactive, Brake light, and ABD light came on all at once. These codes go away when the car is turned back on but as soon as you start driving they come back on. Also I have noticed that since the codes have been thrown the clicking noise doesn't happen when I turn the car off. If i turn it on and leave it running without driving and shut it off the clicking noise occurs. And i'm not talking about the normal exhaust caused little clicks you hear, I'm talking about louder more audible clicks coming from right around the bottom of the engine compartment. Also, at the oil change the guy was checking the tires and my Rear Passenger tire has far more increased tread wear on the inner edge of the tire. Like the inner portion of the tire is almost bald while the outer is fine. What can I do to get that fixed in a cost effective manner. As always I very much appreciate you guys for all you're help.