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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 P0156: Oxygen Sensor AFter TWC, Bank 2 - Signal Implausible >> Diagnosis Procedure >> Check Oxygen Sensor

Check Oxygen Sensor

  1. Heat the oxygen sensors (road test car under load or run engine without load at high RPM).
  2. Connect Porsche System Tester 2 or scan tool and read voltage of oxygen sensor 2 after TWC.

    Display: Voltage fluctuations between 0 mV and 800 mV

    Oxygen sensor OK

    In the case of a display around 0V, give several acceleration bursts for approx. 10 seconds at 6,000 RPM. If 0V is still displayed for 1 or 2 minutes, a short circuit has occurred between the signal wire and sensor ground.

  3. Remove oxygen sensor connector 2 after TWC.
  4. Connect voltmeter to pins 3 and 4 of oxygen sensor connector towards the DME control module.

    Display: approx. 450 mV

    Replace oxygen sensor.

    Display: approx. 0V

    Check wiring harness.

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