As mentioned, some stores don't understand that this is "plug and play". They are pre-programmed and do not need to be activated or programmed. My tire shop (Americas Tire) returned it to me and said they couldn't activate it. I told them not to worry, just install them and I'll do the rest. After installation I followed the TPMS reset/learn procedure and started driving. After 5-10 minutes all four registered.
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