Territory post cat oxygen sensor

[goose]

I've got a 2006 Territory that had the section of exhaust with the cat in replaced. It's an aftermarket item that after a few hundred km triggers the "catalyst below efficiency" CEL.
I'd prefer to not spend money on a new cat, or of course a tune.

So do those oxygen sensor extenders/cheater things make any difference here to avoid the code returning?
Does the ECU actually use the post cat sensors for trims or anything other than determining if the cat is working?

[BigJonWB]

I have fitted a few trickers, they seem to work well.
Post cat sensor should just be to check that the cat is working.

[10sec rx7]

its not the sensor its the cat... you cant use aftermarket cats on them or they throw the light straight away,

either get a tuner to turn off P0420 or put a mini cat in line with the sensor, they are hit and miss but 60% of the time will work

[goose]

Yep that's the code.
Ok, I'll investigate the mini-cat/cheater things. Thanks guys.

[chartreusehj]

Or, drive around for 7 years with the light on like I have.

[nastysven]

Are there any major issues with these older territories? My brother is looking at buying one.

[goose]

It's just a Falcon on stilts, so all the same stuff as BA-BF Falcon, except worse build quality.
Main difference from Falcon is the lower control arm ball joint can flog out fast but a whole aftermarket arm is $160 and 30 minutes to change. Front diff bushes flog out just as fast as the rears.
Parts are cheap and plentiful.

[nastysven]

cheers.