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Home >> Saab >> 1990 >> 900 Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Oxygen (O2) Sensor
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Oxygen (O2) Sensor

  1. Disconnect 2-wire O2 sensor connector. Measure resistance between 2 White wires. Resistance should be about 4 ohms.
  2. Set voltmeter to 2-volt DC scale. Connect voltmeter leads between Black sensor wire and ground. Start engine. Voltmeter reading should vary from 0.1-0.9 volt as sensor temperature increases and air/fuel mixture changes. Replace O2 sensor if resistance is not as specified or sensor reaction time is too slow.
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