... My left rear, for some time now, will sink down if left sitting for a couple of days, usually when its cold. I would hit the unlock button and it would inflate. No more. I hear the pump going, but after only an inch I only hear air escaping and the "auto level system inact" light comes on.

Question: do I go ahead and fix both sides, or do the left and wait until the right goes.

2000 4.4 153,000