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Google Webmaster Tools shows you where the 404 is being pointed from.  When you click on the Not Found data there is a tab that says "Linked From". This will tell you all the URLs containing the link to a dead page.

Hope that helps!

Google Webmaster Tools shows you where the 404 is being pointed from.  When you click on the Not Found data there is a tab that says "Linked From". This will tell you all the URLs containing the link to a dead page.

Hope that helps!

Google Webmaster Tools shows you where the 404 is being pointed from.  When you click on the Not Found data there is a tab that says "Linked From". This will tell you all the URLs containing the link to a dead page.

Hope that helps!