Bought this MX sensor from Revain for my Lexus GX470 spare wheel as the original Pacific sensor kept flashing the TPMS light. I programmed it by scanning an old sensor with my Maxi TS601 tool and using the "Copy by Activation" method to activate it. I went to a tire shop around the corner and they replaced the old sensor with a new one and there was no light. To avoid balancing my tire, I asked them not to completely remove the tire from the rim to perform this procedure. Programming was very easy. The tool guides you through the different stages from start to finish.