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My car was diagnosed with this problem today also. I was told by my good friend (who is also the mechanic) that the leak could be in many places and the best way to find out where is to complete a test in which 'smoke' is pumped through the system to find the area of the leak. It could be due to a hose disconnected, or, a part in the emissions system could need to be replaced. You won't know until it is properly tested. Apparently this is QUITE common in cavaliers. Good luck.

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โˆ™ 2007-03-28 00:05:41
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Q: You have a 2004 Cavalier and the check engine light has been on for 8 months now it says emissions large leak when it was checked any ideas?
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