P1151 Engine Code

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I got this code last summer and I replaced my bank 2 (passenger side? i forget) upstream (that is, between your engine and your cats) oxygen sensor. Are you getting a pulsing rev at and gassy smell at idle?
 
The car idles great and runs awesome at full throttle. The only time I can tell something is wrong is when I'm cruising at a constant speed it feels like the engine has a small amount of hesitation to it - almost like it has bad gas.

I'm not running cats so my car always has a slight fuel smell to the exhaust.

Where did you get your O2 sensor from?