C 230 (203.040) L4-1.8L SC (271.948) (2005)
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Component Identification
The oxygen sensor are voltage free insulated planar (flat) oxygen sensors. The active sensor ceramic consists of a gas permeable ceramic body made of
zirconium dioxide. A protective tube with several slots protects the ceramic body from mechanical stresses and from temperature jumps.
Component Identification
The sensor element consists of a combination of a Nernst concentration cell (sensor cell) and an oxygen pump cell which transports (pumps) the oxygen
ions.
The pump action is a purely physical process.
When operating in combination with the control electronics which are housed in the ME control unit, the wideband oxygen sensor can be measured
exactly in a further lambda range (0.7< Lambda <4.0).
Sensor heater for a wideband oxygen sensor
An integrated sensor heater ensures that it remains at the required operating temperature of approx. 750 °C. The O2 sensor is heated constantly when the
engine is operated in order to guarantee sensor functions when the engine is operated. The sensor heater is actuated by the ME control unit through a
ground signal.
Functional principle (signal voltage) of the discrete oxygen sensor
