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Oxygen Sensor

  1. Disconnect oxygen sensor connector. Start and warm engine to normal operating temperature. Connect DVOM between ground and oxygen sensor voltage signal wire. See Fig 1 .
  2. Note voltage on DVOM. Accelerate engine to enrich mixture, and note voltage reading on DVOM. DVOM must indicate a change in voltage signal. Reading will vary between 150-900 millivolts depending on air/fuel mixture.
Fig 1: DME Control Unit, Fuel Injector & O2 Sensor Connector ID
G91E16497Courtesy of PORSCHE OF NORTH AMERICA, INC.
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