trace it for a crack in the wire and tape it up really wel an not rubbing of anything
thats where i would start cant be anything else really
i got code 12 and 52 when i bought mine and the cable wasnt there and no sensor so i traced back the wire and instaled a thick shielded wire and taped it up well and have a spade connector pushed in the sensor it cleared both codes and hassent come back for almost 3 years now