E 320 4MATIC Wagon (210.282) V6-3.2L (112.941) (1998)
O2 Sensors, Design
Finger Sensor
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
Voltage-free insulated O2 sensors are used.
The active sensor ceramic consists of a gas-permeable ceramic body manufactured from zirconium dioxide. A protective tube with several slots protects
the ceramic body from mechanical stresses and from temperature jumps.
The eletrical connection is performed by means of a 4-pin connector.
The capacity of the sensor heater at operating temperature is:
- 18 W (engines with ME 1.0, 2.0, 2,1)
- 7 W (engine 112, 113 with ME 2.8, engine 137).
O2 Sensors, Function