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Home >> Jaguar >> 2010 >> XFR >> Repair and Diagnosis >> External Pages >> Different car >> Section 128 (Electronic Engine Controls - GTDI 2.0L Petrol -- XF/X250) >> Electronic Engine Controls - GTDI 2.0L Petrol >> Description And Operation >> Electronic Engine Controls - System Operation And Component Description (G1550549) >> Description >> Pre-Catalyst HO2S

Pre-Catalyst HO2S

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

The pre-catalyst HO2S is located in the exhaust outlet pipe between the turbocharger and the catalytic converter.

The pre-catalyst HO2S is used by the ECM to monitor the oxygen content of the exhaust gasses leaving the engine before they reach the catalytic converter. The ECM will check the output from the HO2S to determine the combustion mixture and ensure λ=1 is obtained. λ=1 is the optimum air/fuel ratio which relates to a mixture of 14.7 kg air per 1 kg of fuel (14.7:1).

The HO2S uses current regulation and outputs a linear signal dependent on the ratio of exhaust gas oxygen to ambient oxygen. The oxygen content of the exhaust gasses is measured by comparing it with ambient air drawn into the HO2S

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