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2010 Frontier

Threw the PO448 code. Replaced the vent valve solenoid with a new one and reset the check engine light. Was good for a couple days and then back on again.

What else can be checked/cleaned/replaced in an attempt to get rid of this light?

Thanks
 

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2010 Frontier

Threw the PO448 code. Replaced the vent valve solenoid with a new one and reset the check engine light. Was good for a couple days and then back on again.

What else can be checked/cleaned/replaced in an attempt to get rid of this light?

Thanks
I had to replace the evap canister and the solenoid vlv both, and then run a hose from the solenoid vlv all the way up to the engine compartment airbox on the filter side .
 

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