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O2 Sensor Heating Element

  1. To check O2 sensor heating element, disconnect O2 sensor heating element connector from harness connector. Connect multimeter between connector terminal No. 1 and No. 2. See Fig 1 .
  2. Turn ignition on. Multimeter should read 12 volts. If multimeter does not read as specified, repair break in wiring. Connect multimeter between terminals No. 1 and No. 2 of O2 sensor heating element connector. See Fig 2 .
  3. Multimeter should read 3-15 ohms. If multimeter does not read as specified, replace O2 sensor.
Fig 1: O2 Sensor & Differential Pressure Regulator Connector
G94344Courtesy of AUDI OF AMERICA, INC.
Fig 2: View of O2 Sensor Heating Element Connector
G94348Courtesy of AUDI OF AMERICA, INC.
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