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Oxygen (O2) Sensor Control (2.8L)

  1. Disconnect oxygen sensor connector. See COMPONENT LOCATIONS  . Measure resistance between engine ground and oxygen sensor connector terminal (component side of connector). If resistance is not infinite, replace oxygen sensor.
  2. If resistance is infinite, set voltmeter on 2 volt DC scale. Turn ignition on. Measure voltage between engine ground and oxygen sensor connector terminal (component side of connector). If 350-450 millivolts are present, oxygen sensor is okay. If 350-450 millivolts are not present, check wiring. If wiring is okay, replace ECU.
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