O2 sensor

[tommmmy03]

What is the purpose of one O2 sensor before the cat and one after the cat?:dontknow: :dontknow: Thanks

 

[perk_1405]

i think the first one is for the a/f and the second is to see if the cat is working..

 

[moparracing]

i think the first one is for the a/f and the second is to see if the cat is working..

correct !