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Home >> Saab >> 1991 >> 9000 Base, 2.3 M, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Engine Controls - System/Component Tests >> Oxygen (O2) Sensor
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Oxygen (O2) Sensor

  1. Turn ignition off. Disconnect 2-wire O2 sensor connector. Sensor is threaded into exhaust manifold. Measure resistance between 2 White wires. Resistance should be about 4 ohms.
  2. Set DVOM to 2-volt DC scale. Connect DVOM leads between Black sensor wire and ground. Start engine. With sensor at operating temperature, voltage should fluctuate between 0.1-0.9 volt. Replace O2 sensor if resistance or voltage is not as specified.
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