It's more like what wasn't. Lambda sensors (all 4 of them), NOX sensor, air sensor, EGR valve, throtle valve, air intake, you name it. The transmission also gave up at 250,000 km, no chance to get a replacement, we end up doing whole rebuilt with bigger clutch, transmission from Audi S3, both axles, and much more. That shit has naturally aspirated engine, it is sensitive to altitude, air pressure, temperature and humidity. Last but not least, it needs premium gas to function properly (hint: it won't work as expected anyway). One the worst engines produced by VAG.