German prosecutors searched Opel's operations in Ruesselsheim and Kaiserslautern on Monday as part of a probe into possible diesel-emissions cheating.
Opel, General Motors' former European unit, said last week it plans to stop producing the Buick Cascada in 2019.
Opel said it would stop selling the Cascada, the Adam city car and the KARL at the end of 2019. A spokesman for Buick, which sells the Cascada in the U.S., would not confirm its plans for the car.
PSA is open to new industry tie-ups and is attracting attention from competitors after its lightning turnaround and swift progress in restructuring recently acquired Opel, CEO Carlos Tavares said.
Automakers accounting for almost 40 percent of European sales will be missing from this year's biannual event in Paris.
Opel is marking its ownership switch from General Motors to PSA Group with a new design language it calls "pure and bold."
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