P0455 camry 2004 se 3.3 v6?

i had this check engine light on for about 1 week now. i was told that its an emission code? does that mean i would need new hoses or anything? or is it a major leak? because i cant smell any gasoline. and my car is not leaking nothing. so, im confused. i dont want to take it to a shop and have them charge me 200.00 labor..for a small job. please. help.