Do you want to know where are you losing your visitors due to Error 404 Not Found? No additional tracking code is needed. Simply customize & use this pre-made Google Analytics Report. This broken URL reporting dashboard can help improve user experience and SEO trust factors for your domain.
There are two major cases when “404 Not found” pages are shown…
1) Wrong external link. Then you want to know what external website or marketing campaign it was.
a) Page Source / Medium shows the external website or UTM-based traffic sources (typically marketing campaigns).
b) Page Referrers shows the full URL of a page that a user came from to the “Not found” page.
2) Wrong internal link. Then you want to know what page of your website contains the wrong link. You can recognize these pages as Previous Page Paths.