Nissan Repair: P0135 code on 00 maxima, confussion, harmonic balancer

Question
Code p0135 on reader says that the O2 sensor pos 1 bank 1 heater has went out.  I want to replace the sensor, but is bank 1 the radiator side or the firewall side?  Thanks for any help you can give.

Answer
Hi Craig,

It's the right side looking at the harmonic balancer. Position 1 is the upper one closest to the exhaust manifold. Protector color is black. Blue on bank 2.

Hold on Craig. Alldata has sent me an email on this stating it's on the left. I think the tech that sent it to me is wrong, but I will verify. Sorry about the confussion.

It is on the right side of the engine looking at the harmonic balancer. I was correct. Alldata was wrong. Again, sorry about the confussion. Now go fix your car! hehehe