service engine soon light

[kstng50]

my light just came on yesterday and i got it pulled today and it was P0133 Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 1.
I was thinking of getting an x pipe with cats will i still need to replace the O2 sensor if i put a new x pipe on. If so which O2 sensor is it refering to?

 

[Mirrahasmycar]

you would be better off changing it if there is a problem with it, as for the X pipe, don't waste your time with cats, the catted X pipes cost almost double the O/R, and they won't increase performance that much, I can feel a noticible difference between O/R bassani X pipe and Superchip (has Carb EO# and is burned for O/R exhaust) just hang on to your stock H pipe for emissions testing backup, usually you can pass if you have MIL eliminators, but if not, it only take an hour or two to swap the pipes and chip/MILs

 

[SilverGTV8]

Yeah that is one of the first O2s and will need to be replaced regardless of the type of mid pipe you put on.

If you do go offroad, you will need MILs for the rear O2s.