V50 L5-2.4L VIN 39 B5244S7 (2005)
Center heated oxygen sensor (HO2S) (certain markets only)
Caution! The air lines for the heated oxygen sensors must not be trapped or damaged in any way. The connectors for the heated oxygen sensors
must not be greased under any circumstances. The oil in the grease would disrupt the reference air and the function of the heated oxygen
sensors.
Some vehicles have 3 heated oxygen sensors (HO2S), front, center and rear.
The center heated oxygen sensor (HO2S) is the same type as the rear. However it has a different part number to differentiate it from the rear heated
oxygen sensor (HO2S).
The center heated oxygen sensor (HO2S) is used
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to provide the engine control module (ECM) with information about the remaining quantity of oxygen in the exhaust gases. This information is
provided more quickly than in vehicles with only a front and rear heated oxygen sensor (HO2S)
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to allow quicker start of exhaust purification
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for regulation when the engine is under low loads.
The center heated oxygen sensor (as with the rear heated oxygen sensor (HO2S)) uses voltage control. The signal characteristic is binary. With a binary
signal characteristic, the amplitude of the signal curve changes considerably when changing the oxygen content in the exhaust gases.
Caution! The air lines for the heated oxygen sensors must not be trapped or damaged in any way. The connectors for the heated oxygen sensors
must not be greased under any circumstances. The oil in the grease would disrupt the reference air and the function of the heated oxygen
sensors.
The engine control module (ECM) can diagnose the center heated oxygen sensor (HO2S). The signal can be read using VIDA.
For more information, see Heated oxygen sensor (HO2S) diagnostic See: Powertrain Management/Computers and Control Systems/Description and
Operation/Heated Oxygen Sensor (HO2S) Diagnostic
Rear heated oxygen sensor (HO2S)
Caution! The air lines for the heated oxygen sensors must not be trapped or damaged in any way. The connectors for the heated oxygen sensors
must not be greased under any circumstances. The oil in the grease would disrupt the reference air and the function of the heated oxygen
sensors.
The rear heated oxygen sensor (HO2S) is used to provide the Engine Control Module (ECM) with information about the remaining oxygen content of the
exhaust gases behind the three-way catalytic converter (TWC). This information is used by the Engine Control Module (ECM) to check the function of
