o2 sensor wires

i just got a bosch universal o2 sensor. well the wires are different colors than my oe sensor. anybody know which colors match to which? i know the 2 black wires are heater wires and go to the bosch white wires but i dont know about the other green and gray. i tried different combos and could not get it to stop giving me a cel even when i reset the ecu. could the bosch sensors bigger wires have something to do with it?