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Can anyone tell me how many oxygen sensors are on a Gen 3 Sable. One person told me two, someone else told me four.
 

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This is right off the Ford DVD manual...... Looks like 4. Like the Gen 4 have.
 

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OBD II cars have one before and one after the cat. The one before the cat does all the work as far as reporting back to the PCM about the fuel mixture. The one after the cat monitors the cat's functionality. Seldom is the one after the cat bad.
 
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