ok so im getting codes on bank 1 sensor 1 which is the 02 sensor on driver side that is pre-cat, so i looked and all wires and plugs are good, so im going to replace it should i replace them both while im at it? and what brand is best or not so best? thanks guy

 

Well think of this way..the original Delco has lasted 14 years. I would replace it with another.

 

i would change both, the sensors readings will degrade over time with deposits and such on em and may be giving acceptable false info. check your mpg after and see what happens. check your plugs also, bad 02s can sometimes cause plugs to foul.

 

ya i know its beend running a bit rich since i started getting those codes