My wife's key recently stopped working on our '99 E320 wagon and, after
trying a new battery in the fob with no success, we purchased a new key
from the dealer. Subsequently I've heard that these keys usually don't
break or wear out, but that they 'time out', i.e., they only are programmed
to start the vehicle a limited number of times, say 100,000, after which
they must be replaced. Also, that the ignition system itself will only
work for a limited number of starts, say 600,000, after which it too must be
replaced Can this possibly be true?