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I have a 2002 nissan xterra and my check engine light is on and i checked the codes and got two codes. 1 p0328 knock senser. 2 p1491 cut vavle senser. I change the fule filter hoping that the light would go out but it is still on can you help me.

Vehicle: 2002 Nissan XTerra SE 3.3L

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Start by checking the hoses and the Vacuum cut valve bypass valve. The valve is next to the EVAP canister on the back of your Xterra.

2002 Nissan Xterra Vacuum cut valve bypass valve

P1491 NISSAN - Vacuum Cut Valve Bypass Valve
Read more: https://www.autocodes.com/p1491_nissan.html

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