Help: the check engine light is on

My car is Toyota camry 03, the check engine light is on and the code scan shows: evaporative emissiion control system leak detected ( small leak ), what's that meaning?  And also when the car speeds over 60 mile, there is going be loud noise, maybe from engine.  what's the problem?  Can I fix it myself?  Thank you!

所有跟帖： 

• 回复：Help: the check engine light is on -biglow- ♂ (73 bytes) () 12/16/2011 postreply 11:44:29

• 80% is gas cap loose. -nonego- ♂ (102 bytes) () 12/16/2011 postreply 11:47:12

• Thank you, the cap is tied. I will check others -marie628- ♀ (0 bytes) () 12/16/2011 postreply 13:34:41

• Small leak 不好找呀，在店里用 smoke machine 也不一定能找到，good luck -山里人- ♂ (0 bytes) () 12/16/2011 postreply 18:49:55

• 为什么最主要的字P0442不写？ -专开破车的男人- ♂ (0 bytes) () 12/16/2011 postreply 23:09:15