if i turn off the O2 sensors, what will happen to the fuel / air management ?

code P0420 and P0430 was displayed few time, i removed it with the predator
today another code was displayed P2098
is it something dangerous for the engine and how can i remove those codes permanently.

mod: arh long tube headers, high flow cats, magnaflow catback, cai, diablo tune 93 cai

thanks