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Hello I have an 03 spec v ser Sentra and the check engine light is on. I have a code reader and it is throwing codes the revolve around the evap system. Does anyone know how to replace the evap system? The codes it is throwing are P0441, P0455 and P1448
 

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09 Altima 3.5SE 6MT Sedan
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Clean and lubricate (silicon grease if you have it, veg oil if you dont) the seal on your gas cap, clean the filler neck ensuring no rust is present. Reinstall. If light doesn't go out after a few days of driving, then it's almost certainly your 'vent control valve':

In some Nissan and Infiniti vehicles including Altima, Rogue, Versa, Pathfinder and QX4, the code P0455 is often caused by a bad vent control valve. The vent control valve is located at the back of the vehicle, at or near the charcoal canister. It can be tested by applying battery voltage to the vent control valve terminals. When voltage is applied, the vent control valve should produce and audible click. If there is no click, the vent control valve must be replaced. For some models, the vent control valve design has been modified. An updated part can be ordered from a Nissan dealer. This thread at TitanTalk.com shows how it looks.
 

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09 Altima 3.5SE 6MT Sedan
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