I had error codes 491 and 492 and the fllowing errors on VCDS. Replaced the gasket on the intake manifold and no more error codes. I think the gaskets get old and brittle after 15 years and they need to be replaced. This should get me better gas mileage and better engine performance. I will give an update in a month or so with the mas mileage. But I can already tell my engine has more power. The noise or hissing I heard was from air rushing in under intake manifold. The car is a 2001.5 VW Passat with 2.8 liter V6. It has approx 115k miles on it.
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