Hmm...Interesting thread. I landed here looking for information on what could go wrong next on my 99 RX300. I have 160,000 miles on it and am about the replace the timing belt. I've been through sensors and exhaust work already, but I'm hoping that I can keep this car for about another year or so before getting a new one..I'm shooting for at least 180,000 miles, but we'll see...