I believe so but am not positive. That's my understanding of what they did. This is not a Nissan specific problem either. what mine was doing was getting clogged on the little valves above the canister. They fixed it a couple times and then did the bypass to the engine compartment. One of the probs is the things are right where the front tire kicks back dirt while the rear tosses it off to the front.Bamps, did the dealer run the vent tube all the way to the engine compartment? If so that might be some I would do.