Does participation in AdSense affect my site's position in the Google search results?
Participating in Google AdSense does not affect your site's rank in Google search results and will not affect the search results we deliver. Google believes strongly in freedom of expression and therefore offers broad access to content across the web. Our search results are unbiased by our relationships with paying advertisers and publishers. We will continue to show search results according to our PageRank technology.
Adding the AdSense code to your site will not queue your pages for crawling by our main index bots. While our bot (starting with 'Mediapartners-Google') does crawl content pages for the purpose of targeting ads, participation in AdSense does not increase the number of pages from a site in our main index.