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Within a week or so, after changing my PCV valve, the engine electrical malfunciton light came on the dashboard. After checking out my engine I discovered that a little black plastic hose was not connected to the back of the air filter box. Since then after connecting the hose back to the air filter box, the electrical malfunciton light does not come on anymore. Does anyone know what that little black hose at the back of the air filter box is for in the first place?
 
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