So Im replacing both sensors this weekend. Pretty much just looking for a second opinion on what to get . OEM or after market? Got a hold of an OBDII and threw out both codes for front and rear sensors. Im wonderign if the garage fried em when they welded my exhaust. never had a proble mfor two years the nbam shortly after I had my exhuast fixed engine light goes on. Also tossed an evap/emission leak code so that'll be fun tracing that down.