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1993 B2200 & B2600i Oxygen Sensor

     
Oxygen Sensor

1) Warm engine to operating temperature. Operate engine at idle. Disconnect O2 sensor electrical connector. Connect voltmeter between connector and ground. Increase engine speed to 4500 RPM until voltmeter indicates about .7 volt.

2) Observe voltmeter while rapidly accelerating and decelerating engine speed. Voltage should be 0.5-1.0 volt during acceleration and 0.0-0.4 volt during deceleration. Replace O2 sensor as necessary.