My 2012 CLS550 started sinking in the rear when parked for a couple of days starting probably late November. When we got subzero weather in December, the car was fine in the heated garage but would droop in a few minutes after parking outside. It would lift promptly when started in that case, but wouldn’t lift completely if it was parked outside all day. I’d get the “vehicle rising” message, but fortunately, not the “get towed” message. I got it into the dealer (I have the MB extended warranty, my CPO warranty ran out in December).

Yep, leaking rear air springs...plus moisture in the system. They replaced both rear air springs, the compressor, the compressor air cleaner, and the valve unit. My cost: $0.00. All covered by the warranty. It should be good to go for quite a few years now.

It would be pricey. No prices listed on my invoice, as it was covered. The service manager told me it exceeded my $2500 extended warranty cost by almost 3 times, which seems high. Others here might have a more accurate estimate of costs. The parts alone, being new, OEM MB parts at the dealer, probably came reasonably close to the warranty cost. I have, in the past, read through some of the Airmatic diagnostic stuff that konigstiger has posted. Just those procedures would add up to a pretty high labor cost, before taking it apart and fixing it. Man, there’s a lot of information on this forum!

In my particular case the warranty paid off. If nothing went wrong, I’d be out $2500. I never go to casinos, but this seems similar.

It’s nice to see it up where it should be this morning. The service department at my local dealership was great, by the way. I had a problem, they fixed it, I’m happy.