Originally posted by Contouraholic:
Not trying to start an argument, but I doubt the rear bank gets a measureable amount of greater exhaust flow than the front.



I am saying the Bank 1 Sensor 2 sees greater air flow velocity then the Bank 2 Sensor 2 due to the much better design of the rear manifold. Not airflow before the exhaust manifolds.

It is really plain as day to see how much better the rear manifold is when they are off. Mine have been sitting in my garage for quite a while. I've had plenty of time to look them all over.


Yes I do think heat could play a factor too. More so for pre-cat failure then O2 because Bank 1 Sensor 2 is in the Y-pipe. It is not between the engine and the firewall.

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.