Secondary 02 sensor wiring?

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does it effect the fuel ratio..? will the car run to rich or to low.. if i just dont plug it in.. thanks
 
its mostly an emissions thing... it will throw a code, and the car will run like crap.

do it right.
 
yeah but i thought the primary its for it.. and the second is just to check the cat converter.. if it is workin properly..
 
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