Rear suspension issue
Thread Starter
Newbie
Joined: Feb 2023
Posts: 5
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2007 S550 4matic
Rear suspension issue
Recently changed rear strut and rear level height sensor car raises back to normal when set with computer after driving the car about a mile the car drops back down car will raise back up with computer and stay up if I don't drive but soon as I start driving it drops again used independent shop his computer isn't a star diagnosis system I later found out could the computer be the problem since it's not a star diagnosis or is it something else please help feel like I wasted 1200 on the job now car still down
Thread Starter
Newbie
Joined: Feb 2023
Posts: 5
Likes: 0
2007 S550 4matic
Nothing happens if I push it after it drops I recently changed the pump and valve block upper and lower control arms both front level height sensors as well as rear level height sensor and strut raises with computer calibration and sits fine all around if not driven but soon as I start driving it drops again computer used is not a star diagnosis
Thread Starter
Newbie
Joined: Feb 2023
Posts: 5
Likes: 0
2007 S550 4matic
Nothing happens if I push it after it drops I recently changed the pump and valve block upper and lower control arms both front level height sensors as well as rear level height sensor and strut raises with computer calibration and sits fine all around if not driven but soon as I start driving it drops again computer used is not a star diagnosis
Thread Starter
Newbie
Joined: Feb 2023
Posts: 5
Likes: 0
2007 S550 4matic
Scanned it and it reads code saying rear is up and the front is down although it's opposite way on the car it raises and holds after setting it with computer but drops after driving it about a mile
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Joined: Oct 2010
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Nothing happens if I push it after it drops I recently changed the pump and valve block upper and lower control arms both front level height sensors as well as rear level height sensor and strut raises with computer calibration and sits fine all around if not driven but soon as I start driving it drops again computer used is not a star diagnosis
I have not fooled with the rear sensor. Just wonder if the sensor arm could be installed wrong to do that…?
Last edited by Arrie; Feb 9, 2023 at 08:42 AM.
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MBWorld Fanatic!
Joined: Aug 2014
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S500
Makes me wonder if you somehow have the rear level sensor working backwards. When you start driving the down force pulls car down so Airmatic adds air in springs to maintain level but if your sensor reads backwards the system thinks car is getting higher and takes air out.
was about to type that
Senior Member
Joined: May 2019
Posts: 305
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2007 S550
You're going to need to test and actuate with that computer. Read the ride height at level and read it with a jack lifting it up a few inches.
Here's a theory... You might have a crack in your reservoir tank. When the engine is cold, the crack stays mostly closed. When the engine heats up, the crack opens. This happened to me to a lesser degree and killed 2 compressors.
Here's a theory... You might have a crack in your reservoir tank. When the engine is cold, the crack stays mostly closed. When the engine heats up, the crack opens. This happened to me to a lesser degree and killed 2 compressors.
