O2 Sensors when installing long tubes
Thread Starter
Racer
Joined: Apr 2010
Posts: 384
Likes: 9
O2 Sensors when installing long tubes
I did some searching... do you HAVE to have the front / rear O2 sensors? I have a full tune, and will be going back after the install for a retune and keep hearing you can "tune" them out using HP tuners, but usually people are referring to the rear O2 sensors only... is that true? I will be going with a catless system if that makes a difference.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
You need the front sensors only. The rears only monitor catalyst efficiency. If you have aftermarket metallic substrate CATs that come with most header kits, the rears will not see the same signals that they expect to see with stock ceramic substrate CATs. Having said that most will either leave the rear sensors out or tune them out and leave them in place in case of a visual inspection.
