Audi offered some owners a $5,000 incentive.

Certificates worth $5,000 and good through June 30 were offered to the 150,000 owners of 1984 to 1986 Audi 5000 models wanting to buy or lease a 1987 model. The effort represents Audi’s latest attempt to bolster its image and U.S. sales following allegations that 5000S models with automatic transmission have been involved in accidents, some fatal, related to sudden acceleration. Owners have filed class-action lawsuits against Audi and related firms.