One F.T.C. commissioner, J. Thomas Rosch, said in a partial dissent that the commission would not be able to hold Google to its promises in any meaningful way, as it might do through a contempt proceeding or a fine.

Competitors said the war was not over. Fairsearch.org, a group of Google rivals including Microsoft, said Thursday’s action left the F.T.C. “without a major role in the final resolution to the investigations of Google’s anticompetitive practices by state attorneys general and the European Commission. The F.T.C.’s inaction on the core question of search bias will only embolden Google to act more aggressively to misuse its monopoly power to harm other innovators.”

In a less-watched part of the investigation, which will have a less direct impact on consumers, the commission found that Google had misused its broad patents on cellphone technology, and it ordered Google to make that technology available to rivals. That order may benefit phone manufacturers that use either Google’s Android operating system or competing systems. Some F.T.C. officials said that in the long run, the sanctions could be a bigger victory for consumers, encouraging the development of more innovative devices.

But the broadest impact of the F.T.C.’s action is to present more competitive challenges to companies that do specialty searches, for things like travel or shopping. Consumers will continue to see what has now become familiar on Google — the presence of results that link to Google’s other businesses. When a consumer searches for “airfare to Los Angeles,” for example, the most prominent results are generated by Google’s own travel business, rather than by the likes of Expedia, Priceline or Kayak.

On the company’s Web site, David Drummond, a senior vice president at Google and its chief legal officer, wrote, “The conclusion is clear: Google’s services are good for users and good for competition.”

Mr. Leibowitz, the F.T.C. chairman, called Google’s lifting of content from other Web sites “the most troubling of its business practices related to search and search advertising.” The company agreed to stop taking its rivals’ content, particularly reviews of things like restaurants or consumer products, for use in its own specialized search results.