Just looking thru the maintenance schedule and notice that the valve adjustment maintenance calls for an "audible inspection" at 48 months. My Sienna is actually due now for the same thing. Just wondering if anyone has ever had this done to a vehicle and if it's something as simple as someone sticking their head under the hood with the engine running and listening how it sounds, or is their something a little more to it (some kind of equipment involved). Knowing dealers, I'm just concerned the "audible" inspection is just a ticket for them to tell you a full adjustment is required.

Two climate control systems, one inside and the other at the tailpipe.

2007 Camry Hybrid (in service June 2006)
FE: 6.67L/100km or 35.3 mpg (6.11L/100km or 38.5 mpg in summer)