TDI (engine)

In 1999, common rail fuel injection was introduced in the V8 engine used by the Audi A8 3.3 TDI Quattro.

[1][12] Similar technology has been used by other automotive companies, but the "TDI" marketing term is only used by Volkswagen Group and Land Rover.

[17][18] In 1999, the Volkswagen 1.2-litre TDI won the International Engine of the Year categories for "1.0 to 1.4 litres" and "Best Fuel Economy".

Since 2009, most of the Volkswagen Group TDI engines have switched from unit injectors to common rail injection.

On 18 September 2015 the US EPA and California Air Resources Board served notice to VW that approximately 480,000 VW and Audi automobiles equipped with 2.0 TDI engines sold in the US between 2009 and 2015 had an emissions compliance defeat device installed.

VW has since admitted to these allegations, and said that the illegal software was in use in its diesel cars worldwide, affecting some 11 million vehicles.