(Bloomberg) — Volkswagen AG's worldwide repair of 11 million diesel vehicles to bring their emissions systems into compliance with pollution regulations is shaping up to be one of the most complex and costly fixes in automotive history.

The German carmaker will need to install parts for vehicles already on the road that weren't designed to accommodate the equipment. The work may may need to be done in special shops set up for the purpose. And it will have to pass muster with dozens of countries with their own regulations. VW said Thursday that it was examining whether other diesel engines also have the cheating software.

"I can't think of any other recall that would be as comprehensive," said Jake Fisher, director of automotive testing at Consumer Reports magazine. "It's really an expensive rework."

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