Quote Originally Posted by kung fu jesus View Post
I might also suggest another dealer OR an independent shop that knows this model. If they can diagnose it, they may be able to do the repairs under warranty as well, some can, some can't. At least the diagnosis will be found.

I wonder, too, if it's a similar issue like the BMWs have with their version of VVT (they call it VANOS), when the actuator goes squiffy, it rattles. I'm trying to remember if our Lexus made any sounds similar when the VVT actuator went bad...
my BMW 328 is very quiet