It says front oxygen sensor slow response.. what the hell does that mean? Is it because i've been babying the car lately and it needs to be run a bit hard? I don't know if this is an issue with the X's, but do people use anti-foulers with this car or does it not throw codes like the VIII's and IX's did?

 

do you have a defouler on your front O2 sensor? if you do, thats your problem. and if youre running catless, definitely put a defouler on your rear.

 

no defouler on either... the thing is, i've had the same set-up since a little after xmas and it has yet to throw a single code.

 

possible weather changing, humidity?

 

I just threw a rear O2 slow response code for the first time the other day (don't remember the #). I've had a P0420 code for the cat since I installed my HFC about 10 months ago, and never had any other codes (as far as I know). Just bought a code reader recently and have been checking the codes a couple of times a week to make sure no new codes appear. I was shocked to see a new one the other day, for the rear O2 sensor, but apparently it's in line with my CEL for the cat. I cleared it and it hasn't come back on yet.

Get the code cleared and see if it returns, then possibly worry about it.

 

I actually did clear it once with the AP, it doesn't come right back though, it has taken at least a week to return.