Mercedes-Benz S500 4MATIC Problem Report

Mercedes-Benz S500 4MATIC Airmatic Pump Motor May Fail Due to Sticking Relay

(7 reports)

The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue to run after the car is turned off. Also, Worn airmatic pump mount bushings can causes noises in the front axle while driving on bumpy roads or a buzzing noise while the pump is running.

experiencing the same noise, was told I have a slow leak -
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