P1491 - Manufacturer Control Auxilary Emissions Control
We are getting this code on the 2000 Nissan Sentra. We replaced the cutoff valve ($70.00 dollars from the dealer). This valve is a white plastic connector with 4 hoses attached to it. It is located right next to the evap canister. The code came up after a couple of days of driving. We then replaced the cutoff bypass valve which is connected to the cutoff valve. This has seemed to solve the problem.
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