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Help Please. W212 estate 2010 air suspension

pantopete

New Member
Joined
Jun 14, 2010
Messages
7
Location
Purbrook hampshire
Car
E220 estate
My 2010 E220 has rear air suspension which works fine under normal running conditions but goes down over night, comes back up in the morning no problem. The L & R levelling sensors look pretty corroded and wondered if they might be the cause of the problem. Can anyone recommend a supplier of these parts, apart from MB, as I would like to replace them first before digging any deeper.
 
I doubt it's the level sensors causing the car to sink overnight, more likely a leak in the system, perhaps the valve block.
Get under the car with some leak detector (soapy water) better still have the car on STAR and test the system.
Pretty sure the sensors are Mb only supply
 
I would agree, it’s almost certainly a leak in the system. On my old 212 it was the rear air springs/aka airbags. Seems not an uncommon issue on this model.
 
Don’t worry too much. Getting these things sorted early works out much cheaper in the long run. Air bags are probably favourite but best find an Indy with star to confirm.
 
Are both sides dropping at the same rate?

If they are dropping at identical rates then the leak might be in the pipework before the split to each wheel (the pipework between the compressor and the valve block or the valve block itself).
If they are dropping at different rates (even slightly) then look for leaks in the pipework between the valve block and each air suspension unit.
You can use soapy water to look for air bubbles in the pipework.

The air suspension units are probably the originals so are nearly 10 years old so it is likely that they are leaking and need replacing.

Unfortunately Star isn't much use to you. It will allow the rear to be raised but it won't tell you where the leak is.

The air suspension units aren't too expensive - £400 if buying non-MB or twice that if buying MB.
 
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