My S55 has the power assist door closers on all (4) doors. This week while closing the driver door, I heard a release of air. Thepower latch action did not work. I tried to open and close the door several times but again, the power latch did not operate.

Now I don't hear any release of air and I can only close the door normally. This is not a bad thing! Does any know how this option is set-up?

Thanks for the help/advice.

Lar