C 240 Sedan (203.061) V6-2.6L (112.912) (2002)
3
Lower hose sleeve
4
Contact clip
5
Clamping spring
6
Contact holder
7
Sensor element
8
Upper isolator bushing
9
Inner protective sleeve
10
Outer protective sleeve
11
Steatite packing
12
Sensor housing
13
Outer seal
14
Bottom isolator bushing
15
Inner seal
16
Outer protective tube
17
Inner protective tube
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 power output of the sensor heater at operating temperature is 18 W, 12 W or 7 W.
Electrical connection through 4-pin connector
O2 Sensors, Function
O2 Sensors, Function
1
Sensor ceramic
2
Electrodes at boundary surfaces
3
Exhaust pipe
Arrows
black: exhaust gases
white: outside air
The sensor ceramic is conductive for oxygen ions from approx. 300 °C. If the oxygen share varies greatly on both sides of the ceramic probe body, a
voltage (Nernst concentration cell) is generated on the friction planes by means of the particular properties of the ceramic probe body on the friction
plane. This is a measure for the residual oxygen content in the exhaust.