yeah it will throw the code u can either convert to obd1 or find a book to tell u how much electricity the 02 sensor puts out and put a diode on it so say it runs 5 volts tot the computer for the reading put a diode that won't let it go over 5 volts to the computer all u have to do is solder the wire that goes to the computer which is positive to the ground or negative wire and that will keep the code off while allowing u to have the high flow cat