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Can anyone advise me how many sensors are there and also what should I look for when checking them with an OBD device using an “OBD Fusion” app on my iPhone?.
It seems like I have two sensors shown and one seems to be stable at 0.7 volts and the other fluctuates at engine idle between 0.1 and 0.75 volts. Just really wanting to educate myself on their function and what I should expect using this application. Many thanks ?
 

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2015 CTS 4, 2003 Deville
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There should be 3. One for each Bank, and 1 post Cat. The stable reading is Post Cat. The other two will bounce around. Oopsie, there are 4 Sensors. In and out of the cat.
 
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