Operation CHARM: Car repair manuals for everyone.
Home >> Ford >> 2009 >> F 250 2WD Super Duty V8-5.4L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Oxygen Sensor >> Description and Operation >> Electronic Engine Controls
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Electronic Engine Controls




Electronic Engine Controls


Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor (CMS)

The HO2S and CMS:

- have the ability to create a voltage signal dependent on exhaust oxygen content.
- provide feedback information to the PCM used to calculate fuel delivery.

For removal and installation, refer to Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor - Exploded View Heated Oxygen Sensor (HO2S) and Catalyst Monitor Sensor - Exploded View and Heated Oxygen Sensor (HO2S) Heated Oxygen Sensor (HO2S) or Catalyst Monitor Sensor Catalyst Monitor Sensor.
pro multis · About Operation CHARM