Inregards to why the Audi valve lift 2.0T engines have issues have more problems is tough to say. Its often confusing as Audi and VW use the terms FSI, TSI and TFSI which gets pretty confusing. While the valve lift 2.0T engine says TFSI (on A4 and A5 models others too) it is very different from the TSI engine.

Forums Technical (VW & Audi) an independent Volkswagen enthusiast website owned and operated by VerticalScope Inc. Content on vwvortex.com is generated by its users. vwvortex.com is not in any way affiliated with Volkswagen AG. Discussion forum for the original EA113 4-cylinder 2.0 liter turbocharged
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Overall while carbon buildup in the intake valves can be a common issue for the 2.0-liter TFSI engine found in many Audi TTS models, it can be prevented and treated with proper maintenance and care. 3.1.2. Timing chain tensioner failure Another common issue with the 2.0-liter TFSI engine found in the Audi TTS is timing chain tensioner failure. Bore82.5mm & stroke 84.1mm. I am not aware of a systemic issue with the 1.8T. The 1.8T is EA888 Gen 3 so same design family as the 2.0 S3 engine, and has the same innovations eg balancing shafts, direct and indirect fuel injection (8 fuel injectors) which limit carbon build up & emissions as well as optimise performance, ValveLift,
So let’s learn more about the problems before we cover the overall reliability of the 2.0 TSI/TFSI engine. 1. Carbon Deposits. Carbon deposits are one of the biggest concerns with this engine. This engine is using direct injection and if you are familiar with this system, you know that it is very problematic.
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audi 2.0 tfsi engine problems