Terrence J

Hi, I am new to the forum. My 2015 W212 wagon air suspension is acting strange lately. Apparently, the rear end is sagging on both sides in about 6 hours when the car is off and locked. However, if the car is left open (engine off, doors closed but not locked), the rear end can last 3 days or even longer without clear sagging. Does anyone run into similar issue? My guess, which could be very off base, is compressor and valve block have power when car is not locked and the power somehow keeps some valve shutoff.....

Any help is greatly appreciated!

juanmor40

Definitely an active leak.

Have you scanned the vehicle? Any codes?

using its own power I would have it at its highest setting, lock it and use the diluted soap bottle to track leaks at all connections while waiting to empty. Plenty of time to find it.

here is a must see video for MB air suspensions. He also has a few one about leak diagnostics

Terrence J

Thanks a lot for the quick reply. Sorry I forgot listing the tests I have done. First, there is no code. I used an Autel MX808 but there is no code. I also tried soapy water at all airline connections including the valve block, where air line connects to air bellows on both sides and the air line/compressor connection. I didn't see any bubble. I didn't check the air bellows or the entire air lines yet just because the work involved..

Thanks again!