How do I know the type of engine I have?

Depending on the vehicle, you’ll find the engine code in different places. It can be directly on the engine block, stamped in or on a type plate or else on the cover of the toothed belt. The operating manual might also contain the engine code. If you can’t find it in any of these places, a repair shop can help you.
Differences between TFSI & TSI engines you can find here.