Audi has been forced to stop selling gas-powered A4 and A5 models in Europe, for up to two months.

The stoppage covers new gasoline engine A4 and A5 models as well as S4 and S5 performance models. The S cars don’t share an engine with the A models, but both are affected by the same issue: fuel consumption that was higher than the official number. The news comes from Motoring out of Australia.

The report said that the stop-sale order was issued by the German government. That means that it applies to the entire EU. It leaves Audi, already reeling from a post-dieselgate drop in diesel sales, potentially without gas models of two of its most popular models to sell for up to two months.

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The S4 and S5 have a 3.0-liter turbocharged V6. It’s a new engine, and Audi made some software updates late in development to fix power delivery in some driving modes and make it more responsive in others. The changes gave the cars slightly different consumption and CO2 numbers.

A4 and A5 cars get a new micro hybrid system. It allows improved stop-start and coasting without using the gas engine. It’s a 12-volt system, not the 48-volt one that is slated for the new A8. Audi said that it will deliver better fuel economy in the real world, but it scores slightly worse on the official test. That means re-certification and updating the official consumption figures.

The last-minute changes weren’t the problem. It was the paperwork to get everything certified and get the official numbers posted.

“If you have a change like that you have to tell the traffic authority to certify the process, which needs sometimes four to six weeks. Sometimes it needs two months and we are just in the middle of that process,” explained an Audi spokesperson.

“We didn’t forget to certify it in time. When you test it in the process of getting it ready, and you see the consumption is higher, you have to change the catalogue and everything and tell the authorities,” he added.

It’s not yet known if the changes will affect Audi sales in the U.S.