HO2S signal (front, RH/LH)

PCM terminal: 18, 19 (+)-20 (-)
Oscilloscope setting: 0.2V/DIV (Y), 200ms/DIV (X), DC range
Vehicle condition: idle after warm up

Fig 1: Identifying Oscilloscope Graph HO2S Signal (Front, RH/LH)
Courtesy of MAZDA MOTORS CORP.