Google has upgraded its Ads Diagnostic Tool, a tool that allows AdWords advertisers to determine why their ads may not be showing on a given SERP. Where it previously listed just one reason why an ad might not appear, it now lists multiple reasons, and multiple issues that should be fixed.
The tool is accessible within an AdWords account, either via a magnifying glass icon next to an individual keyword in an ad group or in the account’s ‘Tools’ page.