Is TSI or TFSI better?
Although the Volkswagen TSI is technically superior, both the TSI and TFSI are reliable engines. Despite their issues, both engines are known to last longer than 200,000 miles if maintained with care. The VW 2. TDI engine is considered reliable when properly maintained, but it does have its share of potential problems, particularly in earlier EA189 engines. Common issues like DPF clogging, EGR valve failure, and timing belt problems can be managed with routine maintenance and proactive care.
Why is TDI discontinued?
On 18 September 2015, the US Environmental Protection Agency served a Notice of Violation (NOV) of the Clean Air Act on Volkswagen Group alleging that Volkswagen and Audi automobiles equipped with 2-litre TDI diesel engines, and sold in the US between 2009 and 2015, had an emissions-compliance defeat device installed . Audi (AUDVF) and its parent company Volkswagen admitted in 2015 to having rigged diesel engines to cheat on emissions tests by using software that made cars appear less polluting in tests than they in fact were on the road.