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Oxygen (O2) Sensor

WARNING: This page is about a different car, the 1992 Saab 9000 and 1992 Saab 900. However, it is still accessible from the selected car via links, so may be relevant.
  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 .1 and .9 volt. Replace O2 sensor if resistance or voltage is not as specified.
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