Crawl Errors

Crawl errors fall into several categories, each with different causes and solutions^[1]. 404 (Not Found): the most common — the page doesn't exist at that URL. Usually caused by deleted content, URL structure changes, or typos in internal links. Fix by implementing 301 redirects for pages with links, or let Googlebot naturally stop crawling pages with no links over time. 500-series errors: server errors that prevent Googlebot from loading the page. Common causes: server overload, database connection failures, or code errors. Prioritize these — they may affect multiple pages simultaneously and can cause temporary deindexing. Soft 404s: pages that return a 200 OK status but display 'page not found' content — harder to detect but equally problematic. Redirect errors: chains, loops, or redirects to pages that subsequently error.

Google Search Console's Index Coverage report categorizes all URLs Google has attempted to crawl by status: Valid, Valid with warnings, Excluded, and Error^[1][2]. Focus on the Error category first — these are pages Google tried to index but couldn't. Within errors, prioritize by: pages that previously had organic traffic (check GA4 for historic traffic), pages with significant inbound backlinks (check Ahrefs for external links to the 404 URL), and pages in your XML XML Sitemap (these are pages you've told Google should be indexed). Screaming Frog crawled alongside Search Console data gives a more complete picture — it finds crawl errors that Search Console may not report because it only shows what Googlebot has attempted, not what might be reachable.

Proactive crawl error prevention is more efficient than reactive fixing^[2]. Before deleting content: check if the page has any inbound links (internal or external) — if yes, implement a redirect to the most relevant live page before deletion. Before restructuring URLs: implement all redirects simultaneously with the change, not after. After any deployment: immediately crawl with Screaming Frog or a similar tool to catch any newly introduced errors. Set up crawl error alerts in Search Console — Google will send email notifications for significant increases in crawl errors. Check the Coverage report monthly as routine maintenance. For large sites, a scheduled weekly crawl using Screaming Frog with automated error reporting provides early warning of crawl health degradation before it impacts rankings.