Car is throwing a P1133 Code any1 know how to fix this

[Phirepower]

My gm846 cammed formula is tossing this code up every time I drive it. I scanned it and it said it was an air/fuel ratio issue. My car retains all stock and legal emissions components and other than the cam, full exhaust, and full bolt-ons it remains stock internally.

Is this something a tune could fix? Or what sensor has failed and caused this shitty situation? Car does seem to be slightly down in power, but still hauls faster than it did prior to the cam install. Thanks Guys

[DMBlack]

The code is for a bank 1 sensor 1 o2 not switching. Have you had the car tuned. May be a bad o2 sensor or lack of tune.

[Phirepower]

How can I tell which o2 is on bank one? I have stocked up on replacement O2's. I am guessing that my factory tune is not cutting it but I will replace the o2's just to be safe. Thanks^

Any other thoughts?

[Chris]

Bank 1 is the Front side of the motor with cylinder 1 and if you car is cammed without a tune it will eat thoose o2's alive

you could switch the o2' sides and see if the code changes

[Phirepower]

^ am I risking damaging the motor running it for a week or two more untuned, after I replace the faulted o2?

[Chris]

Well if you are running very rich and killing your o2 sensors you are going to wash out your rings

[Phirepower]

I guess I will need to get a tune very soon.