yeah its the front one air/fuel as far as i remember.not boxed as it came off a car in the uk with low miles.bought from api in the uk.i used it for the nct and it was perfect and took it out afterwards.only bought it as i thought my sensor was fcuked,the problem was i wasnt heating my race cat up hot enough!! check your part numbers on your sensor.the number on mine is 22641 AA042 denso original subaru part.ring a subaru main dealer and cross reference it to be sure.in Dublin.southside.
that is grand , I will come back to you tomorrow, in process of selling the car so if buyer wants to fix it himself I will send him your way or else I will take it myself