Got in the car to come home today--started, put my foot on the brake and heard a mild "Clunk" and hiss, felt the gearshift knob vibrate while still in "Park".

First time it has happened since new; now about 4700 miles on the S430.

Reproducible by letting off the brake while in "Park", and depressing the pedal again.

I know there is a "lockout" to prevent engaging the gears from "Park" and you have to press the brake pedal to override it. It has to be the "gate" that is making the noise and that I feel moving around down there.

Any ideas what is wrong? Why is it audible and palpable after being imperceptible from new?

 

My moms car does the same thing.

 

mine does that too