wide band 02 sensor

[aaronr]

Can I mount the wide band 02 sensor after the cat in the rear 02 sensor location and will be accurate or do it need mounted befor the cat?
Thanks

[bvd80]

Can I mount the wide band 02 sensor after the cat in the rear 02 sensor location and will be accurate or do it need mounted befor the cat?
Thanks

No, it must be mounted before the cat.

[ScarabEpic22]

No, it must be mounted before the cat.

Actually Ive heard from a few people, both on here and on other forums that it doesnt make much of a difference...between .1 AFR pre and post cat. Personally I have mine mounted pre-cat because it's only about 1" from the factory manifold so the response time is very close.

To the OP, if you can put it pre-cat Id recommend it for faster response to transient throttle conditions.