Component Inspection

Engine Control
P2A00 HO2S Not Ready (Bank 1 / Sensor 1) - Inspection/Repair:_:Component Inspection

Component Inspection

Check the Signal waveform of HO2S
1. IG "OFF" and connect HO2S connector.
2. Engine start.
3. After warming-up, monitor signal waveform of HO2S with scantool.












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?