My 02 sensor was slightly damaged and i also had to get it off so i cut the wires. There are blue white and two blacks im assuming the two blacks are the same does anyone know forsure they should be grd and shouldnt matter if they were backwards thanks

 

up

 

im not sure but if you are cutting your 02 wires you are in bad shape to begin with... that gives your sensors some major issues

 

how? not if a proper splice is put in.

 

a proper splice is almost always not sealed properly... not air tight