The car comes with 2 O2 sensors. One before the cat used to control fueling, one after to let the robot know if the cat is going out. At least one should be before a catalytic converter.

 

Did you put one nonfouler or did you use both?

 

ive always hated the headers that put the o2 sensor in 1 pipe....doesnt get a accurate reading that way

if it was me, i would put the first 1 where you have it circled in red, then put the second one after the cat



thats how i had mine ran, no CELs for over 3 years

 

i have...well had before machanic flipped the downpipe.. an o2 sensore before and after cat and it still gave me a cel





i put one on were i have it circled it was a 18mm and that didnt help at all unless you have to put on on both





i may try that instead of putting on snap on resistores to lower the reading to the ecu. i would just have too extended the first o2 cable and some how run it to the down pipe with out being in the way of the drive axle and have a bung welded to the down pipe

 

I have both and no cel.