I finally got my stock exhaust back on and got all the codes to clear then 2 more codes keep popping up P2A01 (o2 sensor 1/2 circuit performance) and P0137 (o2 sensor 1/2 circuit low) The dealer went to order 2 new ones to put in and there is 26 of them on back order. Have any of you got these codes or needed a o2 replaced I wasnt aware there was a problem with them but I guess there is.