car had been sittin for almost a full 24 hours in the cold, about 30-40* and when i fired it up it had a malfunctioning o2 code thrown. i have headers and jsut the front o2's. when i looked at the o2 numbers on warm up the passenger side o2 was about 60 mV lower then the driver side, well i guess thast what it is it was the 3rd one lower than the 1st on the predator. cant remember what bank it was on though. could i replace my front o2's with my rear ones that i took out a while ago? is it the same part number? and is this a common code with headers and cold o2's? car got hot and the light never came back on. thanks

 

What code # was it??
Was it a heater circuit code?

 

yeah im pretty sure, i was in a hurry so i was dumb and deleted it without lookin at the number, sorry. but im almost positive it said malfunctioning o2sensor heater circuit or something, and like i said it never came back up.

 

It prolly will come back sooner or later, & it'll most likely be the O2.

 

so can i put the rear o2 on the front, is it the same?

 

yeah, the fronts and rears are the same