Newer versions have an air trap over the hole leading to the pressure sensor. The purpose of the air trap is to prevent clogging of the pressure sensor. Yet, I was receiving the i20 error.
Turns out, the air trap itself can get clogged. It is easy to remove it by partially unscrewing the screw holding it, pulling the upper part to the right side, then pulling the bottom part out of the pressure sensor hole. Just make sure you don’t damage the gasket.
Rinse the air trap in warm water, and reinstall.