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Home >> Audi >> 1991 >> 100 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Relays, Solenoids, Motors & Modules 2.3L >> Oxygen (O2) Sensor Heating Element
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Oxygen (O2) Sensor Heating Element

  1. Disconnect O2 sensor heating element connector from harness connector. Connect voltmeter between harness connector terminals No. 1 and No. 2. See Fig 1 .
  2. Turn ignition on. Voltmeter should indicate battery voltage. If voltmeter does not indicate battery voltage, repair open circuit.
  3. Connect ohmmeter between O2 sensor heating element terminals No. 1 and No. 2. See Fig 2 . Ohmmeter should indicate 3-15 ohms. If ohmmeter does not indicate 3-15 ohms, replace O2 sensor.
NOTE: The following figure is Courtesy of Audi of America, Inc.
Fig 1: Identifying O2 Sensor Heating Element & Differential Pressure Regulator Harness Connectors Terminals
G94344
Fig 2: Identifying O2 Sensor Heating Element Terminals
G94348Courtesy of AUDI OF AMERICA, INC.
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