(AP) — Volkswagen believes it can fix some of the diesel vehicles caught up in the carmaker’s cheating emissions scandal without compromising their performance, an attorney for the company said Thursday.

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Lawyer Robert Giuffra told a federal judge that Volkswagen believes the repair for cars with 3-liter engines wouldn’t be complicated and would bring them up to their original standard.

“It’s just a process that will take time because of the need to do the durability testing to make sure that that fix is a long-lasting fix,” he said.

U.S. District Judge Charles Breyer in San Francisco is overseeing lawsuits against Volkswagen in the wake of the scandal. Attorneys announced this week that they reached a deal to compensate owners of about 475,000 Volkswagens with 2-liter engines.

Volkswagen is working on a fix for those cars, but has not yet come up with one. The deal, which still requires Breyer’s approval, would give owners of the 2-liter engine vehicles the option of a buyback.

The remaining 85,000 vehicles caught up in the scandal have 3-liter engines.

Breyer scheduled a hearing for Aug. 25 to get another update on progress toward a settlement for those vehicles.