A system and method for utilizing a humidity sensor with an internal combustion engine of a vehicle is described. Specifically, information from the humidity sensor is used to adjust a desired air-fuel ratio to reduce engine misfire while improving vehicle fuel economy. Further, such information is also used to adjust timing and/or lift of the valve in the engine cylinder. Finally, diagnostic routines are also described.

 
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< Cylinder and valve mode control for an engine with valves that may be deactivated

> Variable valve timing system

> Drive of variable valve lift mechanism

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