Where exactly is the Bank 1 sensor 2 oxygen sensor located. Bank 1 means that it is on the firewall side of the engine i believe but don't know the exact location of sensor 2. Does anyone know this or know where to go look it up. I think Bank 1 sensor 1 is the one that is plugged directly into the exhaust manifold on the firewall side of the engine. This is the failure indicated by a P0136 OBD 2 code. Any help would be appreciated.

If you look on the exhaust manifold leading to the exhaust pipe you will see what looks like a spark plug located in the pipe and that is it I changed mine with PB blaster and an adjustable wrench. Hope that helps.