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O2's sensor downstream issue

pinkic81

Elite Explorer
Joined
September 7, 2014
Messages
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Year, Model & Trim Level
2003, sport trac
Hello to all, I have aquestion of oxygen sensor B2S1 of my ford automatic explorer sportrack 2003, 4.0, 6V.

There is not Check engine light on.

There is not reading with my scanner

Image s1 just show 3 o2's sensors.

But what's is the function of downstream sensor? on my scanner i can't see the graphics "S2"

The reading of downstream shouldn't be like "s3"? red circle

Thanks in advance.
 

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  • s3.png
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