DTC P2273 - O2 Sensor Signal Biased/Stuck Rich (Bank 2 Sensor 2)

WARNING: This page does not describe the selected car, but rather 24 other vehicles, including the 2019 Lincoln Navigator, 2019 Lincoln Nautilus, 2019 Lincoln MKZ, 2019 Lincoln MKT, and 2019 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

DTC DESCRIPTION P2273 - O2 SENSOR SIGNAL BIASED/STUCK RICH (BANK 2 SENSOR 2)

For Edge, 2.7L Nautilus, 2.7L
Description: This DTC sets when the heated oxygen sensor bank 2, sensor 2 (HO2S22) signal is greater than the calibrated lean value during the current key cycle and, after three consecutive intrusive events, the signal cannot be forced less than the calibrated lean value.
Possible Causes: Aftermarket exhaust accessories or performance modifications Ethanol content in the fuel HO2S22 circuit intermittent Damaged HO2S22
Diagnostic Aids: Check for leaks in the exhaust system. Check for an intermittent HO2S22 signal.
For All Others
Description: The heated oxygen sensor bank 2, sensor 2 (HO2S22) is forced rich and lean and monitored by the PCM. This DTC sets when the PCM does not detect the output of the HO2S22 in a calibrated amount of time.
Possible Causes: Pinched, shorted, and corroded wiring and pins Crossed HO2S22 wires Exhaust leaks Contaminated HO2S22 Damaged HO2S22
Diagnostic Aids:
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Edge 2.7L, Nautilus 2.7L	GO to PINPOINT TEST DW .
All others	GO to PINPOINT TEST H .