Google has removed BMW's German website from its index for violating Google's guidelines against trying to manipulate search results.

The move was first reported by Google's Matt Cutts in a posting to his blog . He said BMW's German website had been removed last week because certain pages on the site would show up one way when the search engine visited the page but when a web user opened the page, a redirect mechanism would display a completely different page.

Cutts wrote that the practice violates Google's guidelines, particularly the principle that states: "Don't deceive your users or present different content to search engines than you display to users." Google's guidelines also specifically include an item that recommends that website creators don't employ cloaking or sneaky redirects.

Cutts' blog posting also said that Ricoh's German website would be removed from Google's index soon for similar reasons. In mid-January, Cutts wrote in his blog that he was offering a courtesy notice to designers of non-English language sites that starting in 2006 Google would be paying closer attention to tricks that go against Google's guidelines.

A Google spokesperson confirmed via e-mail that the BMW site has been removed but would not comment further on the specific case, adding that Google cannot tolerate sites that try to manipulate search results.

Cutts wrote that he expects that Google's spam team will require a re-inclusion request including details on who created the misleading pages before BMW.de is included in the database again. He said that some of the offending pages had already been removed.

Removing BMW.de from the Google database sets a high-profile example because BMW's website practices have been discussed online for years, said Hellen Omwando, a principal analyst at Forrester Research. Still, Google's actions don't tackle the source of a problem, she said.

"Google needs to focus on enhancing its algorithms to deal with this kind of situation because right now BMW isn't the only company that does this," she said. In addition to better technology, Google should add some human editors to help prevent manipulation, she said.

Companies commonly employ a range of techniques to try to ensure that their sites rank first when users search for them. Part of the problem that Google faces, however, is that there's a fine line between site optimisation and tricky practices that manipulate results, Omwando said.