I bought these for my Corolla 09. Dealer and body shop gave me about $100 or quoted $10 for EACH sensor. In my experience they are very easy to connect and require no programming. I installed them when I did the balancing and camber. First the TPMS light came on again, maybe a day after installation. I installed my own tire pressure monitoring system on the nips which detected a slow leak on my right rear tire. I ignored this as the tire would not deflate after I inflated it again. I found out later that I had a nail on my right rear the entire time that was driven in tight enough that not much air was escaping.