Investigation and class action suit seeking to recover damages against Volkswagen and Audi on behalf of all persons who have purchased model year 1997 through 2004 Audi vehicles equipped with 1.8 litre turbo-charged engines, and model year 1998 through 2004 Volkswagen Passat vehicles equipped with 1.8 litre turbo-charged engines. The case alleges that defendants engaged in unfair and deceptive practices by concealing and failing to disclose engine problems in these vehicles, including a predisposition to the formation of harmful deposits that can lead to serious damage and dangerous engine failure.