Fiat Chrysler shares declined more than 5 percent Monday following a report from German newspaper Bild. The weekly circular indicated that FCA may be banned from selling its vehicles in the country if it is proven that the company is not complying with emissions regulations.

On Sunday, Bild am Sonntag reported that the German motor transport authority (KBA) had discovered evidence that the exhaust treatment systems in some FCA models were being disabled after 22 minutes. Standard emissions tests typically take about 20 minutes.

For its part, FCA responded to the claims by stating that “all its vehicles are compliant with existing emissions rules.”

The German government has increased its level of vigilance in evaluating engine management systems and software since the VW diesel emissions scandal erupted in September.

Germany is second only to Italy in terms of FCA’s annual national sales.