Home >> Genesis >> 2019 >> G90 3.3T Premium, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis - 3.3L (6 Of 6) >> DTC P2251: O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) >> Specification >> [HO2S] (Bank 1, 2/Sensor 2)