Saturday, March 3, 2012

Ford Focus Heated Oxygen (HO2S) Sensor?


Heated Oxygen (HO2S) Sensor
OPERATION
REMOVAL & INSTALLATION

Details are as follows :----

Operation



The catalyst efficiency monitor uses pre and post-catalyst heated oxygen sensors (HO2S) to infer the hydrocarbon (HC) efficiency based on the oxygen storage capacity of the catalyst. Under normal, closed-loop fuel conditions, high efficiency catalysts have significant oxygen storage. This makes the switching frequency of the post-catalyst HO2S (B) very slow and reduces the amplitude of those switches as compared to the switching frequency and amplitude of the pre-catalyst HO2S (A). As catalyst efficiency deteriorates due to thermal and chemical deterioration, its ability to store oxygen declines. The post-catalyst HO2S (B) signal begins to switch more rapidly with increasing amplitude, approaching the switching frequency and amplitude of the pre-catalyst HO2S (A).

Removal & Installation



With Secondary Air System
  1. Disconnect the battery ground cable.
  2. Disconnect the electrical connector and detach the wiring retainer. 

    image
    Fig. Disconnect the electrical connector and detach the wiring retainer
  3. Remove the evaporative emissions (EVAP) canister purge valve heat shield.
  4. Remove the four bolts and position the exhaust manifold heat shield aside.
    NOTE
    If necessary, lubricate the heated oxygen sensor (HO2S) with penetrating and lock lubricant to assist in removal.
  5. Using a 22 mm crows foot wrench, remove the HO2S. 

    image
    Fig. Removing the heated oxygen sensor
  6. Installation is the reverse of the removal procedure.
    NOTE
    Make sure that the electrical connector locking tab is engaged.


    CAUTION
    Make sure that the sensor wiring is secured with all retainers and routed away from hot surfaces and sharp edges.


    NOTE
    Make sure to apply anti-seize lubricant to the threads of the sensors before installation.
Without Secondary Air System
  1. Disconnect the battery ground cable.
  2. Raise and support the vehicle on a hoist.
  3. Unsnap the electrical connector heat shield.
  4. Disconnect the electrical connector and detach the wiring retainer. 
    NOTE
    If necessary, lubricate the heated oxygen sensor (HO2S) with penetrating and lock lubricant to assist in removal.


    image 
    Fig. Disconnect the electrical connector and detach the wiring retainer
  5. Using a 22 mm crows foot wrench, remove the HO2S. 

    image 
    Fig. Removing the heated oxygen sensor
  6. Installation is the reverse of the removal procedure.
    NOTE
    Make sure that the electrical connector locking tab is engaged.


    CAUTION
    Make sure that the sensor wiring is secured with all retainers and routed away from hot surfaces and sharp edges.


    NOTE
    Make sure to apply anti-seize lubricant to the threads of the sensors before installation.
This details will help.
Thanks.

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