98cobratx

ive posted similar threads but now im kinda worried so i wanna get it all straight i put an o/r h pipe on my car about a month a half ago and put on the MILs and everything no check engine light or anything i even went to the track with the new o/r pipe and everything was good. then about 2 weeks ago my check engine light came on i couldnt figure out why so ive go a friend that works at a auto part store and he just erased the code and everything was good but then like a day or two the light came on again it was the same code it was something like catalytic Deficiency and o2 something. OK but theres one more thing i had a friend help me on the install and he says he put the MIL's in the front of the pipe and in a previous thread they told me they go in the back is this true?? i asked my friend about it and he said there was no way to put them in the back??? the pipe was a MAC o/r h pipe

JJ03MustangGT

first off too many people have too many problems with mils, just get a tuner to fix the code

2000GT4.6

MILS ON THE BACK!!

You MUST have them on the back 2 o2 sensors. Having them on the fronts is a recipe for disaster.

Get under there and check it out, its gotta be on the back 2 02 sensors. The fronts are what the car uses to tune itself, the backs are the cat's check.

98cobratx

are you serious man thats not good he said there was no way to put them in the back what should i do

uofipilot

You should learn some grammar, yo. After that, from everything i've read, which is alot, I've always seen them on the rear o2 sensors. Those are the sensors that tell the ecu if the cats are functioning properly.

Matt

98cobratx

ok i just jacked the car up and the MIL's are in the back so he thats ok but i still have my CEL problem how much is it for a shop to get rid of the code

P.S. i didnt know i had to be proper on a forum teacher lol

NXgt

Get a tuner.