I just replaced my cylinder heads Tuesday and now I am getting a po1151 code that says bank 2 sensor 1, which side is bank 2? By the way after doing a lot of reading here I found several things. My 98 was leaking coolant between the block and heads to the outside but was running fine until last week the it began to shutter at times then the CEL came on and threw a both banks lean code. I had ordered heads 3 months ago with the plans to do it in the spring until the missing. When I tore it down I found 2 of the intake studs loose on the fuel rail, and both heads had cracks between the valves. It now runs great but needs an O2 sensor, I guess the antifreeze took it's toll. Can anyone tell me which O2 sensor this is?
Thanks

bank 2 is the passenger (right) side according to ford service tech.

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92 Ranger XLT
Fordstrokers 347 TFS 205 cnc track heat heads
Parker Funnel Web intake, Pro-system 780 carb, full MSD ignition, headman headers
TCI 3500 stall converter, AOD built (inhouse) with TCI kit, 8.8 out of 04 Ranger
(inhouse)=in the house on the kitchen table
http://www.youtube.com/watch?v=DhuJE04Up8Q

Thanks Nitro!