hi iv got a new rear lambda sensor for my subaru impreza 2.0i gx awd 2002 and the wires are 2 white 1 black and 1 gray,now the wires on the loom are 1 blue,1 gray,1 black and white and 1 red and yellow,plz can some 1 help me to match them up as the old lambda is gone?????thanks