Several car manufacturers have been involved in diesel emissions cheating allegations over the years, with the most notable cases including:

1. Volkswagen (VW): The most infamous case began in 2015 when it was revealed that VW had installed software in diesel vehicles to cheat emissions tests. This scandal affected millions of cars worldwide and led to significant legal and financial repercussions for the company.

2. Audi: As a subsidiary of Volkswagen, Audi was also implicated in the emissions cheating scandal, with many of its diesel models affected by the same software.

3. Porsche: Another Volkswagen Group brand, Porsche, faced scrutiny for its diesel vehicles, which were found to have similar emissions cheating software.

4. Fiat Chrysler Automobiles (FCA): In 2017, the U.S. Environmental Protection Agency (EPA) accused FCA of using software that allowed its diesel vehicles to emit more pollutants than allowed under federal law.

5. Mercedes-Benz (Daimler AG): The company has faced allegations related to emissions cheating, with investigations into its diesel vehicles for potentially using defeat devices to pass emissions tests.

6. Renault: The French automaker has also been investigated for its diesel emissions practices, with allegations of using software to manipulate emissions results.

7. Nissan: Similar to Renault, Nissan has faced scrutiny over its diesel vehicles and their compliance with emissions regulations.

These allegations have led to significant legal actions, fines, and a push for stricter emissions regulations in the automotive industry. The fallout from these scandals has also accelerated the shift towards electric vehicles as manufacturers seek to restore their reputations and comply with environmental standards.