i had my car reset yesterday by autozone for free.. the cel kicked on after 20 minutes again. the obdII system indicated a general failure in both o2 sensors.. for those who didnt read my other post in modifications , i had cut the 02 sensor prematurely.. so im thinking that possibly the switched wires are playing a roll in this issue. my main question is to all those who recently did the header on there car..

number one.. if i mess up the rear o2 would that cuase the front 02 to fail by default (this ones pointed to marvin)

#2 .. i have a serious exhaust smell outside my car.. i know i just removed my precat. but this is even worse than it was before.. could it be possible im getting too much fuel?? (this may account for my awesome dynos too )

#3 aside from the smell is there any other indications of a bad cat??

#4 i need a hug..

id really appretiate some help.. and remember this is a 2001 SE sentra with two )2 sensors ;)