Conditions for Running the DTC

WARNING: This page is about a different variant/trim than selected.

Before the ECM can report DTC P2251 or P2254 failed, DTCs P0030, P0031, P0032, P0050, P0051, and P0052 must run and pass.
The HO2S heater control is enabled.
The HO2S heater is at operating temperature.
The internal HO2S sensing element resistance is more than 570 ohms.
The ECM detects the internal HO2S signal voltage is between 1.47-1.53 volts.
DTC P2251 and P2254 run continuously once the above conditions are met.