Yes both O2 sensors need to be hooked up. they work together in read exhaust gas and it wont run right if only one is reading. And it will blow the other one preatty damn fast
Exactly the only thing its going to do its what Ryan said is make it run leaner with I guess would deliver for gas to the motor but wont give you anymore HP
If you have intake and head upgrades, sometimes it actually helps out not having the O2 sensors connected on a SD system...but yeah, in general they should be hooked up if you want decent gas mileage.
in addition if u have mass air car, the computer will go into a preprogrammed mode if the o2s are not reading and itwill be slower
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