TPMS Question
 

I searched the forums under this topic but still have a question.

I have an 09 Si and just put aftermarket wheels on it. I ordered them from Tire Rack with the TPMS sensors installed. When I installed the wheels I did not get the TPMS warning light. I was under the assumption that the dealer had to activate them or something. Is it possible that they don't need to be activated?