2006 Mercedes-Benz ML500 Questions

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The main battery was replaced 3 years ago, could it be the small battery beside it?
Hours after I came home, my car has a loud horn like sound coming from under the hood. Theres a big black ball looking thing on the right hand side close to the dashboard that stops the noise when pressed in. What is this and how do we shut it off?
Just bought a ML500 from a car dealer, can hear the drive shaft, not bad bad I guess can just hear it wen driving.
Car also nudges forward sometimes when I stopped & waiting, my foot is on the brake & its in Drive, what is that?..
Also a clunk happens at times when gear change or go to accelarate.
Reverse is quite hard sometimes wen I go to accelerate, have to press the foot peddle at least half down to get movement. If anyone can enlighten me in these things, would greatly help, Thanks Sonya
The buzzing sound lasts for about 2min then goes off, was told air shocks adjusting.
I have the brake light repair kit already installed and still not working I replaced the turn signal bulb socket and light bulb as well.
Replace Sam module 1 month ago n rear windows will not go down n head lamps will not work
Recently purchased 2006 ml500 with low miles. Rear suspension seams to "bounce" 3-4 times after every bump in the road.
Has lots of V-8 punch at cold startup, then it is slow to respond to accelerator after warmup.
The rearview auto dimming mirror (and driver side mirror) dims randomly. The sun is shinning and the mirrors dim.
I parked and it wouldn't start up again. someone came to help me and pulled out the spark plug and it started up. I drove it again without any problems for two weeks. Now two days ago I parked it and cut off the engine. Trid to restart it again and it wont start. Could it be the crank shift if im not getting a message?
No leaks, level full, belt good. Steering is difficult at idle RMP -- difficult maneuvering in driveway/parking but returns to normal after RPMs exceed 1000, or car is at running temperature. Is it just air in PS system or bad PS pump? If it's air, can I get it out or is a PS pump replacement inevitable?
With almost 200k miles on odo, besides this and one other thing, car runs great. Car was loaded to capacity, or possibly over capacity, on several occasions. My best guess is that the shock absorbers need replaced, but wanted to make sure before I dish out 800$ on replacements.
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