something i know some do is add a sparkplug antifouler to raise the 02 sensor out of the direct path of the exhaust. people do this for high flow cats

not sure if it will fix your issue or not but for under $10 it might be worth a shot

 

Yup, its in there!!

 

NYJOE

What have you done to your car so far?

 

new cats, o2's all 4, plugs, wires, coils, fuel filter

 

and you have the antifouler on both rear 02 sensors?

 

No, took them off when I put the new cats in. Think I should try them again?

 

yes, thought thats what you meant by "Yup, its in there!!" lol. but yes try it see what happens, cant hurt anything

 

yea sorry frustration talking, had tried with the old cats, but yea you got me thinking now.

 

Haven't done anything to the Equinox of late other then driving it. Then one morning right out of the blue my hard to get rid of P0420 code and check engine light are
gone. And yes the light bulb is working.