2001 XJ with the 3 cat system. One of my manifold mounted cats is going out, i constantly get below efficiency codes. How can I fool the computer into thinking it's fine? Im not going to spend $500 on a new pair of cats so is there a dummy o2 sensor available or an easy way to clean them??
P.S.
I live in Michigan where we dont have emissions tests so Im not concerned about that whatsoever.

 

Emissions are federal, not state.

Per forum rules we cannot discuss removal or alteration of emissions equipment.