DTC Description

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.

ECM shows P2237-00 when the conditions are like below.

Deviation of average correction value of fuel ratio is higher than 0.1 when sensor voltage is 1.49~1.5V
Accumulated air mass flow value is higher than threshold value when target lambda is 0.97
Upstream O2 sensor displays 1.7V below when the fuel cut is being kept over 3 minutes.