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Home >> Audi >> 1995 >> 90 Base, 2.8 A, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Heated Oxygen Sensor (Ho2S) Control

Heated Oxygen Sensor (Ho2S) Control

  1. Disconnect HO2S connector. See ELECTRICAL COMPONENT LOCATIONS  . Measure resistance between engine ground and HO2S connector terminal (component side of connector). If resistance is not infinite, replace HO2S.
  2. If resistance is infinite, set voltmeter on 2 volt DC scale. Turn ignition on. Measure voltage between engine ground and HO2S connector terminal (component side of connector). If 350-450 millivolts are present, HO2S is okay. If 350-450 millivolts are not present, check wiring. If wiring is okay, replace PCM.
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