The 4 cylinder only has "Bank 1". The V6 has "Bank 1" (rear cylinders by firewall) and "Bank 2" (front cylinders by radiator).
I'm thinking the "sensor 2" is the O2 sensor after the pre-cat in the exhaust manifold. There should be an O2 sensor before the pre-cat and one after the pre-cat. The pre-cat is the catalytic converter in the exhaust manifold, located just slighter after it comes out of the head.
Last edited by Altima SSS; 04-14-2009 at 04:14 PM.
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