Airmatic Struts deflate over night

Asked by Nov 13, 2016 at 12:02 PM about the 2005 Mercedes-Benz S-Class S 430

Question type: Maintenance & Repair

Hi,

I have an airmatic strut question:

Background:
1) About a month plus ago I had a rear strut fail.
2) I replaced both rear struts (which was a bit of a hassle).
3) Before the mechanic could get the passenger side rear strut to calibrate properly I needed to go out of town.  I was concerned that the struts would be calling for the strut to extend and that the struts would max out and be damage, so I disconnected the battery.
4) Upon returning, and reconnected the battery and the car started fine and I returned the car to the mechanic for what he thought was the answer of replacing the wiring harness the passenger side strut connects to.
5) Now he says he’s getting a fault with the passenger side strut sensor (which he also says is the valve) and says that the strut has to be pulled and replaced, i.e., it is defective.  Before I let him do this I brought the car home and I’m looking for your guidance on how to correct this issue with the added information.

What I notice is when I turn the car on all four struts inflate to what seems to be a reasonable height when looking the gap between the top of tire the edge of the wheel well.  When I turn off the car and it sits (12 hours for example, I don’t know the minimum amount of time but it is at least several hours), all four struts are deflate.

So, it does not seem like replacing the strut is the correct solution.  Questions which come up in my mind are:

1) Could an air leak in one strut, deflate the other three struts?
2) What else could be the issue?
3) What else should be checked?

Thanks,
Ben

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