Should you really fix all those lingering 404 errors in your Search Console?

Why does Google keep crawling URLs that return a 404?

The behavior is more strategic than it seems. When Googlebot encounters a 404 error, it does not immediately erase the URL from its memory. It schedules later attempts spaced out in time to ensure that this page is not temporarily unavailable or hasn't been restored in the meantime.

This is particularly relevant after a failed attack or migration. Google has already indexed these URLs, it knows them, and its algorithm wants to confirm that their disappearance is permanent before completely removing them from the index. This process can take several weeks or even months for large sites.

Does this persistence of 404s degrade my SEO performance?

No, and that’s the key message from Mueller. 404 errors do not drain your crawl budget unnecessarily, contrary to what many anxious SEOs still imagine. Google manages these retries with minimal weight in the crawler's queue.

They have no impact on your indexing of existing pages or on your overall ranking. A clean 404 simply signals that the content no longer exists, which is legitimate information for a search engine. This is infinitely preferable to a soft 404 or a fuzzy 302 redirect.

When do these 404s really become problematic?

The nuance lies in the nature and origin of the 404s. If these errors come from a recent attack that injected thousands of spam pages now deleted, it’s normal and healthy cleaning. Google will gradually forget these nuisance URLs.

On the other hand, if your 404s correspond to strategic pages deleted without redirection or to URLs pointed to by strong external backlinks, you are losing juice and qualified traffic. In this case, action is required: redirect via 301 to equivalent content or recreate the page if it had value.

• 404s do not block the crawling or indexing of other pages on the site
• Google automatically retries error URLs to check for potential restoration
• A clean 404 is preferable to a forced redirect to the homepage or an inappropriate page
• Only strategic 404s (backlinks, historical traffic) need corrective action
• The Search Console displays these errors even after several weeks to ensure crawl transparency

Is this statement consistent with real-world observations?

Yes, and it’s even one of the few communications from Google that is perfectly aligned with measurable reality. Tests on sites that have gone through complex migrations or have suffered attacks show that 404 volumes have no negative correlation with overall organic performance.

I have seen sites display several thousand 404 errors in the Search Console for months without any degradation in their visibility. Conversely, sites with a pristine Search Console but chain redirects or massive soft 404s have seen their traffic collapse. What matters is the quality of the signal sent to Google, not the complete absence of errors.

What nuances should we apply to this official advice?

Mueller talks about a post-attack context, where 404s are the result of legitimate cleaning. But all SEOs know that some 404s deserve more attention than others. If a URL still generates clicks from the SERP or regularly receives fresh backlinks, leaving it as a 404 is clearly a strategic error.

It’s also important to distinguish classic 404s from disguised soft 404s: those pages that return a 200 but show “content not found.” Google hates them because they disrupt its crawling and indexing. A true HTTP 404 is infinitely cleaner and clearer. [To verify]: Google has never published numerical data on the exact tolerance threshold for 404 volumes before a site is considered “algorithmically unstable.”

In which cases does this rule not apply completely?

On high turnover e-commerce sites, leaving all deleted product pages as 404s can become counterproductive. References that will never return deserve a 410 Gone to accelerate de-indexing. Those returning in seasonal stock should ideally switch to a 503 temporary or keep a lightweight product listing.

Another exception: news sites or blogs that massively delete old content. If these pages still generated long-tail traffic or held strong editorial backlinks, letting them die as 404s without an alternative is pure waste. A thematic consolidation strategy with targeted redirects preserves juice and authority.

What should I do concretely with these 404s lingering in the Search Console?

Step one: segment your 404 errors by origin and potential. Export the Search Console report and cross-reference it with your historical Analytics data to identify URLs that generated qualified traffic. These URLs deserve action: a 301 redirect to equivalent or similar content.

Second filter: run your 404s through a backlink tool like Ahrefs or Majestic to detect those still holding authoritative incoming links. A dead page with 15 DR60+ backlinks is a net juice loss. Redirect it to the thematically closest page or recreate even better content on that URL if it truly had value.

What mistakes should be avoided when faced with an endless list of 404s?

Do not give in to the temptation to massively redirect all your 404s to the homepage. This practice is frowned upon by Google as it sees it as a disguised soft 404. A relevant redirect should send the user to genuinely equivalent or closely related content, not to a generic entry point.

Avoid also the manual removal request for each 404 via the Search Console. It is time-consuming and unnecessary: Google will naturally forget them in a few weeks if they remain inaccessible. Focus your energy on the 404s with high business or SEO impact, not on cosmetic cleaning of the report.

How can I check if my site is managing its 404 errors correctly?

Manually test a few URLs returning 404 and ensure that your server correctly sends a clean HTTP 404 code, not a 200 with an error message or a haphazard 302. Use a tool like Screaming Frog or Google Search Console to cross-check your reported errors with your real server logs.

Set up regular monitoring of the new 404s appearing in the Search Console. A sudden spike often signals a fresh technical issue: poorly configured migration, failing plugin, or ongoing attack. React quickly to these alerts rather than letting a situation that could worsen deteriorate.

• Export the 404 report from the Search Console and cross-reference with Analytics to identify traffic-lost URLs
• Check backlinks on the major 404s with Ahrefs or Majestic
• Redirect via 301 only the strategic URLs to equivalent content
• Confirm that the server indeed returns a clean HTTP 404 code, not a 200 or 302
• Implement a weekly alert for new 404s to detect technical anomalies
• Never redirect massively to the homepage or a generic page