I have gotten the dreaded o2 sensor code for my car. Instead of buying a new o2 sensor would a set of MILS eliminate this? I plan on getting an H-pipe soon.

 

is it the upstream or downstream sensor? the downstreams will get fixed with the mils, but you cant use them for the fronts. The backs are just for emissions.

if its a front, try switching the two sensors and see if the code swaps sides. if it does, id say you have a bad sensor on your hands. Otherwise it could be an exhaust leak or any number of things.