Having same CCT with my 2007 as well, now at 26,000 miles. Once engine warms up above 160 degrees, tapping noise starts and goes intermittent. Can here it when stopped at lights, very annoying. Went to mechanic and he said no big deal, just wait till noise gets worse, then bring it in to replace. Can anyone confirm that CCT noise does not affect engine?? And if not, what hat is the noise/signal/indicator that it does need to be replaced??