My 2016 Audi A3 2.0T has 75,000 miles and is past its warranty. I’m not a mechanic and not familiar with car parts but I’m good at DIY and there’s a place near me that makes repairs with parts I buy for cheap.

What are some car parts I should look at, anticipating that within another 10,000 to 20,000 miles I might get a check engine light or a related issue?