How to trace 4XX errors in campaign data?

[WebSupportGuy42]

I am trying to resolve a number of 4XX (Client Error) issues noted in my campaign report, but I have no idea where they are originating. All I get is the broken link, the status code, the page authority and the number of linking root domains.

How do I identify where the erroring link originates? Is it coming from within my website, or from an external website? I have gone through my site in great detail looking for these links, but can't find any evidence of them. I also use a broken link detection plugin and it reports no problems whatsoever.

Is there a way I can drill down into these 404 links and get more detail about where they are coming from?

[Klarke]

Check Google's Webmaster Tools for the website.

Go to Health > Crawl Errors ..then click on the "Not found" box to display the list of URLs that are returning 404s or 410s.  Now click on any of the 404 URLs and a pop-up box will appear with three tabs.

Under the "Linked to" tab, they usually indicate how they found that URL (whether from internal or external pages).

It sometimes lags with the updating though.