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Home >> Volvo >> 1999 >> C70 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition And Control Systems - Design And Function (Convertible) >> DENSO (B5244S; 2000) >> Input signals >> Rear heated oxygen sensor (HO2S)

Rear heated oxygen sensor (HO2S)

The heated oxygen sensor (HO2S) operates with the same signal characteristics as previously, but has gained more importance for controlling the fuel/air mixture. The rear heated oxygen sensor (HO2S) has been moved forward nearer to the front heated oxygen sensor (HO2S), just in front of the metal monolith in the catalytic converter.

When the front section of the catalytic converter is first affected by a fault in the fuel/air mixture the rear heated oxygen sensor (HO2S) can sense it sooner and send a signal to the engine control module (ECM) to light the malfunction indicator lamp (MIL) faster. This location also means that the rear heated oxygen sensor (HO2S) warming up time is shorter.

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