Ok well I have all new zzp downpipe with cat, bad-mab shorty header and cat back exhaust iv been driving it for a week now but nothing serious like 30-to a hour drive just 15-10mins to work. So I put a new o2 sensor in and I keep getting the p0420 code yesterday I put the new sensor in and did a car diagnostic and it said no codes so I did a code earse to get the engine light off so I drove alil and it came back on with the same code so I took it out today and put it back in to make sure no leaks in exhaust or any were and there wasnt so I did another diagnostic and it said no code but hapen to drive alil today also but engine light came back on with p0420 code and yes it is the right o2 sensor....any idea???

Thanks.

 

http://www.oreillyauto.com/site/c/detail/DOR3/42009.oap

http://www.ebay.com/itm/Vibrant-Performance-Standard-Oxygen-Sensor-Fitting-11621-/390600253242?pt=Motors_Car_Truck_Parts_Accessories&hash=item5af196df3a&vxp=mtr
Use either of these. I'd use the Vibrant one honestly.