oneunderone

okay so i installed mac longtube headers on my car and now the check engine light is on pulled the codes and here is what came up

PO133 ox s cir
po153 ox s cir

SLW RESP 1 S1
SLW RESP 2 S1

any suggestions to help me solve this?

mustanglouie

yeah post up more videos of your exhaust lol. Sorry I do not know the answer to your question.

2k7gtcs

Do you have a tuner? Did you get a new tune to turn off the rear O2 sensors from someone like Brenspeed, Bamachips, or Tillman?

aircare84

You'll need to add some delay into the forward O2 sensor circuits. You'll have to have one of the aftermarket tuners dial this in for you.
Not sure on the MAC headers, but on my OBX's the fwd O2 sensors are in the header collectors & I had to install extenders.
Brent told me that the O2 sensors will run cooler than factory in the collectors. I still get an occasional P0153 & am working with Brent to get an acceptable delay in the circuit without throwing other codes.
It's only an annoyance issue & has not affected the performance at all.
The other option is to have the CEL turned off.

officespace56

Correct me if I am wrong here but couldn't he get some MIL eliminators?

08VistablueGT

Yup, simple, need to have the tune changed due to the repositioning of the forward stream o2's. Some aftermarket longtube headers make sure to keep the bungs at the same length as factory, however other's do not. Good luck!

05fordgt

I get his code every so often and like the others its a small annoyance. I just clear it and move on. I have found a happy medium though. When I start the car, I let it run for a few minutes or so, and I never through a code. When I start the car, and drive right away, the code gets thrown and I get the CEL. Its an easy fix.

StangRalle

You need a new tune to use the long tube headers without any error messages... Check with Brenspeed.

08VistablueGT

Oneunderone, do you have a tune by Bamachips, Brenspeed, or someone else? If so, they can alter your current tune to compensate for the new o2 positions.