2006 Mercedes-Benz S430 4MATIC Questions

All 2006 Mercedes-Benz S430 4MATIC Questions

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When I turn on the car the air pump making a noise and when i stop the car it keep running and making a noise until I unplug the fuse.
When driving the car and the warning light came on"re safe unavailable" car switched to lower gear. Another light came on :reduce oil:. Prior to that there was water leaking from the front of the car. Please advice. T...