The light could under certain conditions. However, if you hear a hissing sound, that is half the battle. With the engine cold, start it and spray some carb cleaner in the area of the noise. If the engine revs up, you found the leak. It is just a matter of locating the specific hose.
NOTE: Carb cleaner is flamable. Be careful when doing this. If could cause a fire. Make sure to have a fire extinguisher near by for oil fires and avoid spraying directly onto extremely hot engine parts such as an exhaust manifold.
Let me know what you find. And yes, I feel the dealer could find the problem.
Thursday, May 13th, 2010 AT 1:38 PM