F 150 2WD V8-4.6L VIN 8 (2009)
Oxygen Sensor: Description and Operation
HO2S
Electronic Engine Controls
The HO2S:
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sends the PCM a signal indicating oxygen content in the exhaust before the exhaust enters the catalytic converter.
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provides feedback information to the PCM used to calculate fuel delivery.
The CMS:
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sends the PCM a signal indicating oxygen content in the exhaust after the exhaust leaves the catalytic converter to calculate catalytic converter
integrity.
