Modded Mustang Forums banner
1 - 8 of 8 Posts

·
1 Wheel Peel
Joined
·
3,747 Posts
Discussion Starter · #1 ·
Quick question.

With the programmer you can turn off the rear o2s. Does this "remove" just the post cat ones or both the pre and post cat sensors
 

·
Not A Regular Member
Joined
·
17,101 Posts
It's been a long time since I used my tuner but I don't remember seeing anything for O2s. So unless I just missed it, I think you have to have a custom tune written to turn off O2s.
 

·
Registered
Joined
·
1,358 Posts
It only removes the post cat ones. You need the pre-cat ones for your ECU to determine the correct Air/Fuel ratio.

With a newer SCT firmware that has to be done by whoever creates the tune itself and is no longer a user changeable option.
 

·
Registered
Joined
·
1,358 Posts
Its on there under the egr on/off
Interesting, from everything I've read the newer ones don't have the option anymore. I'll have to take a look on mine sometime.
 

·
1 Wheel Peel
Joined
·
3,747 Posts
Discussion Starter · #6 ·
I'll have to check to be 100percent but taking the cats off didn't setnoff a light eithrr
 

·
Registered
Joined
·
3,379 Posts
It took the downstream off when I got the tune from AM, but dont you need the upstream ones. :confused:
 

·
MOAR BOOST
Joined
·
9,163 Posts
The front 02's you need, they let your ECU know what your A/F ratio is like. The rears just say if you have cats or not.
EGR can be turned off with a tune also.
 
1 - 8 of 8 Posts
Top