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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 Wiring Harness

Check Wiring Harness

  1. Remove oxygen sensor connector 1 after TWC.
  2. Connect special tool 9637 to wiring harness (DME control module connector).
  3. Connect voltmeter to special tool 9637, pin II/17 and ground.
  4. Switch on the ignition.

    Display: 0V

  5. Switch off ignition.
  6. Connect voltmeter to special tool 9637, pin II/11 and ground.

    Switch on the ignition.

    Display: 0V

    If battery voltage is displayed, check wiring harness for chafing and pinching damage.

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