Mercedes S-Class W221 Rear Air Bag Failure — Sagging Corner
The rear Airmatic air springs on W221 develop leaks at the rolling lobe rubber diaphragm or at the top mount connection. One rear corner drops overnight. The car becomes uncomfortable and the compressor runs excessively. Individual air bag replacement costs £200-450; replacing all four simultaneously is more economical on high-mileage examples.
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No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz S-Class 2005 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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