The engine air filter element for the Nu 2.0 liter GDI inline four cylinder motor in a second generation (2014, 2015, 2016, 2017, 2018 & 2019) should be cleaned at every oil change and replaced every 30,000 miles or at least every 48 months (4 years). Check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.