lamda

I recently bought a 3.8 coupe 6 speed. i get a PO 0018 code. which is bank2 sensor a out of sync. dealer replaced both ocv on driver side. Cleared code and sent me on my way. it came back within 30 mins of driving. the car experiences zero power. it bogs down on acceration. if i shut car down...

I've test driven both the Genesis 4.6 V8 Tau and 3.8 V6 Lamda trying to decide between the two. Both cars has tech packages. Is it my imagination that the V6 steering seems lighter and that the quality of the ride is slightly better, that is that roads bumps are not transmitted to the occupants...