Up for sale is a harness to eliminate the P0420 or P0430 Catalyst below threshold code. If you can not tell from the pictures if this plug is your correct style, message me with make and model I will check for you. This harness plugs directly between your O2 sensor and the factory wire harness. This harness will not fix your car/trucks catalytic converter or a problem in the O2 sensor relating to the heater side of the sensor. The harness will only effect / cancel the P0420, P0430 codes. This harness is ment for off road or racing use only. The harness will fit many Toyota, Scion and Lexus cars and trucks. If you are not sure if it will work for you, message me and I will check for you. The easiest way to tell is to look at my pictures and compare them to your car/trucks plug ends. Please look at the pictures to confirm fitment on your vehicle.