Oxygen Sensor Ahead of TWC, Bank 1 - Signal Implausible

P0130

Oxygen Sensor Ahead of TWC, Bank 1 - Signal Implausible

Function
To diagnose the readiness for operation of the oxygen sensors, the position of the sensor voltage is evaluated (diagnosis is disabled in the case of certain faults or conditions).

Diagnosis conditions

P0130:

Wiring Diagram







Diagnosis Procedure







1 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 1 ahead of TWC.
Display: Voltage fluctuations between 0 mV and 800 mV.

- Oxygen sensor OK.

If a value around 0 V is displayed, a short circuit has occurred between the signal wire and ground.
If a value between 100 mV and 300 mV is displayed, limited voltage increase is present.
If a value between 550 mV and 1500 mV is displayed, a shunt circuit to battery positive voltage is present.

3. Remove oxygen sensor connector 1 ahead of TWC.
4. Connect voltmeter to pins 3 and 4 of connector to DME control module.
Display: approx. 450 mV.

- Replace oxygen sensor.

Display: less then 400 mV or greater then 500 mV

- Check wiring harness.

2 Check wiring harness.
1. Remove oxygen sensor connector.
2. Connect special tool 9637 to wiring harness (DME control module connector).
3. With an ohmmeter, measure resistance between special tool 9637, pin II/15, and oxygen sensor connector, pin 4.
Display: 0 - 5 ohms

4. With an ohmmeter, measure resistance between special tool 9637, pin II/9, and oxygen sensor connector, pin 3.
Display: 0 - 5 ohms

3 Check output stage of DME control module.
1. Connect special tool 9637.
2. Remove oxygen sensor connector 1 ahead of TWC.
3. Connect voltmeter to pins II/9 and II/15.
4. Switch on the ignition.
Display: approx. 450 mV

If the display reads less then 400 mV or greater then 500 mV, replace DME control module.

4 Perform adaptation.
1. Switch on the ignition.
2. Wait one minute.
Do not press the accelerator.

3. Switch off the ignition for at least 10 seconds.
4. Read out the fault memory.