The Audi A3 Sedan TDI® Engines

We introduced TDI to the roads in 1989, and since then, we’ve continuously refined it, including developing common-rail technology. Under this system, a series of piezo injectors uses electrical charge to precisely control the amount of fuel injected into the engine. As well as reducing noise, this allows combustion to happen at a lower temperature, with less oxygen, which lowers emissions.