A lost DESS key is annoying, but in most cases no reason to panic, as long as a second functioning key is still available.
What is important in this situation
With one remaining key, new keys can be programmed and the lost key simultaneously removed from the system so that it no longer works if it reappears.
Manage keys yourself
With M-JET DIAGNOSTIC, you can see all programmed keys at a glance and program new keys or remove old ones, all without a dealer visit.