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Home >> Porsche >> 2000 >> Boxster Base, Standard >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Cruise Control Systems >> DME 7.2 - 911 CARRERA & BOXSTER >> DTC P0138: Oxygen Sensor After TWC, Bank 1 - Above Limit >> Diagnosis Procedure >> Check Oxygen Sensor

Check Oxygen Sensor

NOTE: This check must be performed with the engine cold.
  1. Remove oxygen sensor connector 1 after TWC.
  2. Connect ohmmeter to pin 1 and pin 4 of the oxygen sensor connector towards the oxygen sensor.

    Display: infinity ohms

  3. Connect ohmmeter to pin 1 and pin 3 of the oxygen sensor connector towards the oxygen sensor.

    Display: infinity ohms

    If 0-5 ohms is displayed, replace oxygen sensor.

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