Focus L4-2.0L (2009)
Oxygen Sensor: Description and Operation
Electronic Engine Controls
Electronic Engine Controls
The HO2S:
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has the ability to create a voltage signal dependent on exhaust oxygen content.
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provides feedback information to the PCM used to calculate fuel delivery.
The CMS:
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has the ability to create a voltage signal dependent on exhaust oxygen content.
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provides feedback information to the PCM used to calculate catalyst efficiency.