Oh Man! Here we go again, having a 2000 ES300 with 71000 miles, 7 yrs old, I'm opening the TB shoud cover to inspect for crack or damage or leakage if any. Rather be on the safe side! Just got a master key made here at a local Locksmith cost $ 430.00 (never had a master key when bought May of last year, I'm da second owner) cheaper then the dealer $600-1,400.00