MrNeal7

I Own A 2000 S430, And My Right Passenger Side Of The Car Started To Sink To The Ground. I Turn The W220 On And The Car Will Rise But Soon As I Start Driving The Car Will Sink And The Message On The Dash Will Read "Airmatic Stop, Car Too Low!" I Hear The Hissing In The Shock, And I Have Read It May Be The Relay Or Air Valve. But No One Is Instructing How To Check Or Change This Things. I Need Suggestions On What I Need To Check So I Can Center The Problem. I'm Not Looking At A Dealership Reference Or Mechanic.

wallyp

Go to the top of the first page of the Forum, find the sticky thread (in blue) that includes the words, "start here", and start there. The thread includes a huge amount of useful info, including what you need to know about the leaking Airmatic strut.

Short answer, you appear to have a blown Airmatic strut that must be replaced. The usual suggestion is to install a rebuilt strut from Arnott - lifetime warranty, not a very difficult job, less than half of dealer cost.