Oxygen Sensor Heating Ahead of TWC

P1119
15 Oxygen Sensor Heating Ahead of TWC, Bank 2 - Above Limit

P1119
15 Oxygen Sensor Heating Ahead of TWC, Bank 2 - Below Limit

P1119
15 Oxygen Sensor Heating Ahead of TWC, Bank 2 - Open Circuit

P1119
15 Oxygen Sensor Heating Ahead of TWC, Bank 2 - Signal Implausible

Function
The heated oxygen sensor generates a current signal, starting at approx. 300 °C, which provides information about the fuel/air mixture. This signal is used for the regulation of fuel injection. The oxygen sensor is heated to bring it quickly to operating temperature in order to start oxygen sensing earlier.

Diagnosis Conditions:

Wiring Diagram:

Diagnosis Procedure - Above Limit:

Diagnosis Procedure - Below Limit:

Diagnosis Procedure - Open Circuit:

Diagnosis Procedure - Signal Implausible:

1 Check resistance of oxygen sensor heating.

1. Remove connector of oxygen sensor 2 ahead of TWC.
2. Connect ohmmeter to pin 1 and pin 2 of the oxygen sensor connector towards the oxygen sensor.
Display: < 2,6 ohms at 25 °C

2 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.

3 Measure resistance between oxygen sensor housing and oxygen sensor heating.

1. Remove connector of oxygen sensor 2 ahead of TWC.
2. Connect ohmmeter to pin 1 of oxygen sensor housing and oxygen sensor connector towards the oxygen sensor.
Display: infinity ohms
3. Connect ohmmeter to pin 2 of oxygen sensor housing and oxygen sensor connector towards the oxygen sensor.
Display: infinity ohms