What about Genuine Honda part? Is Denso better?Dont need a part number there is no oxygen sensor that your referring to. It's a fuel air ratio sensor, likely why you cannot find the part. Buy only Denso part, look it up as 2008 CRV Fuel Air Ratio sensor IIRC and can find it easily
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Easy way to remember is B1 S1 is a A/F Sensor (costs more) and B1 S2 is a 02 sensor.Likely last time he dealt with it, they called it that. This happens with some parts, like car buff said, usually called O2 sensor.
Just did a quick search, we're talking same part. Oxygen/Air-Fuel Ratio Sensor