Quote Originally Posted by boostedcompg View Post
^^ the pcm doesnt use anything from the secondary o2 for engine managment, so your car runs the same with or without it. just turns on the SES light. but in a few of the 04+ ive seen (mine included)they run fine with the rear o2 and no cat. but if u dont know what ur doing spend the 15 bucks and buy em
not true. tell that to a ton of 01+ guys that can't stop their car from running pig rich without a rear o2 sensor.