i was wondering, i have a gsr witu not the oem cat... 67 error code. 98 gsr

the out o2 stays at .2 volt and is veeeeerry slow to move... is it supposed to go .1 to .9 quickly like the in o2?

are jobber universal o2 ok or i need to buy a 230$ oem o2

is that sensor essensial or is it just to tell the cat is fucked?

i heard some just replace it by a resistor

thank you for helping :P