Volkswagen in Germany announced Wednesday its fix for millions of its 1.6- and 2-liter diesel engines in Europe that are illegally spewing nitrogen oxides and have cost the company billions in a massive worldwide scandal.

According to the automaker, a small “flow transformer” would be fitted in front of the air mass sensor in 1.6-liter, EA189 engines. The small transformer will calm air leaving the air filter before reaching the sensor. Volkswagen says the calmer air will allow the sensor to more accurately measure airflow for combustion. The fix would take less than an hour. For 2-liter engines, the proposed fix would be a software update and would take 30 minutes. Both plans have been approved by the German transportation authority.

Both fixes may be headed to cars in the U.S. However, the announced plan was in Germany for engines only on sale in most of Europe. Volkswagen submitted its U.S. plan last week to the Environmental Protection Agency and California Air Resources Board, but details of that plan haven’t been released.

Volkswagen said it would begin recalling cars in Europe in January, and that the recall would take roughly one year to complete.

According to the automaker, the performance of the affected cars would remain the same after the fix, but that testing had not yet been completed on those cars.

Volkswagen will submit next month its plan to fix 1.2-liter, three-cylinder engines fitted into its cars in Europe. The fix announced Wednesday will also apply to SEAT, Audi and Skoda vehicles fitted with the 1.6- and 2-liter engines.