Component Inspection

P2273 O2 Sensor Signal Stuck Rich (Bank 2 Sensor 2)

Inspection/Repair - Component Inspection

Component Inspection

Check the condition of HO2S
1. Check HO2S for poor connection or loose terminal.
2. Check if HO2S is ensurely installed.
3. Is the conditions of HO2S normal?





Check the Signal waveform of HO2S
1. IG "OFF" and connect HO2S connector.
2. Start Engine
3. With engine at operating temperature, monitor signal waveform of HO2S with GDS.












Fig.1) Normal waveforms of upstream HO2S (the upper) and downstream HO2S (the lower) (chassis ground used)
Fig.2) Normal waveforms of upstream HO2S (the upper) and downstream HO2S (the lower) (sensor ground used)
4. Is the sensor switching properly?