O2 Sensors, Task

O2 Sensors, Task




1 Electrical connection
2 Sensor housing
3 Active ceramic probe body
4 Electrode (inner)
5 Electrode (outer)
6 Heating element
7 Inner, open combustion chamber
8 Protective tube
9 View of electrical connection for O2sensor
1 Sensor heater
2 Sensor heater ground
3 O2 sensor signal ground
4 O2 sensor signal
G3/1 O2 sensor downstream of TWC
G3/2 O2 sensor upstream of TWC
G3/3 Left O2 sensor upstream of TWC
G3/4 Right O2 sensor upstream of TWC
G3/5 Left O2 sensor downstream of TWC
G3/6 Right O2sensor downstream of TWC

Records the residual oxygen in the exhaust gas and sends a signal to the engine control unit.

O2-sensors upstream of the catalytic converter: The O2-sensor signal is needed for
- Lambda control
- Self adaptation of the mixture formation
- Function chain tests.

O2-sensors downstream of the catalytic converter: The O2-sensor signal is needed for
- Two-sensor control (USA) and EURO3/4
- Monitoring catalytic converter efficiency