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Home >> Audi >> 1993 >> 100 CS, 2.8 K, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests >> Fuel System >> Fuel Control >> Oxygen (O2) Sensor Control
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Oxygen (O2) Sensor Control

  1. Disconnect oxygen sensor connector. Refer to the ELECTRICAL COMPONENT LOCATIONS  table. 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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