3. O2 Sensor Operation

Start the engine.

Allow the engine to reach normal operating temperature.

With the DRB III(R), read the O2 Sensor voltage.

Fig 1: Reading O2 Sensor Voltage

Courtesy of DAIMLERCHRYSLER CORP.

Is the voltage switching between 0.4 and 0.6 volt? 

1. Yes  >> Go To 4
2. No  >> Go To 8