Pw0 Error Code

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i jus swapped a first gen b16 into my 90 crx si. my PW0 ecu is giving out da error code 2 and i cant find newhere wut it means. neone know wut 2 stands for?
r u shure its blinking 2 if its 2 long blinks its 20 if it is followed by any short blinks they r the single
__ __ _ = 21
yup, its the 2nd o2 sensor, i got the same problem...the thing is, i have no clue where that 2nd sensor is..........
Did you add a 2nd O2 sensor??? If you didn't add one or tap both wires into your single O2 sensor, it will throw a code because its looking for 2 O2's and one is missing