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Originally Posted by javajaws
But if you are doubting that a carbon filter can become exhausted then I suggest you read up on how carbon filters work....in short they clean air by trapping chemicals in the pores of the carbon...which lose their efficiency over time as the pores of the carbon fill in and eventually become "full". Once the carbon has been used up it is doing nothing but getting in the way. BTW, the chemical process for this is adsorption (not absorption).
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You're correct on the adsorption part, but it is not a permanent bond.
The carbon will be regenerated (ie. the trapped gas molecules that permeated out from the engine will be released) everytime when the car is started up and air flows into the airbox past the regular and charcoal filters into the engine.