Component description for O2 sensor - GF07.04-P-6100IC
ENGINE 648.960 with CODE (474) Particulate filter with CODE (926) Low emission EURO4
ENGINE 648.961 with CODE (474) Particulate filter with CODE (926) Low emission EURO4 with CODE (494) USA version
Arrangement illustrated on model 211
The O2 sensor is located under the air filter housing at the front in the firewall catalytic converter.
Task
The O2 sensor detects residual oxygen content in exhaust and sends a corresponding signal to the CDI control unit (N3/9) which uses this signal for quantity mean value adaptation (MMA).
Design
The O2 sensor is a planar broadband oxygen sensor (two cell limit current sensor) which integrates together several functions as a result of its modular design.
Function (schematic)
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 coupled to regulating electronics which is integrated into the CDI control unit the O2 sensor can take exact measurements in a wider Lambda range
(0.7< a <4.0).
An integrated sensor heating system ensures that it remains at the required operating temperature of approx. 750°C. The O2 sensor is heated constantly while the engine is running in order to obtain the special functions.