I bought a obd2 plug and play chip from these guys, plugged it in, and 2 weeks later my car would not start. I removed it and it started. I informed them I believed I had a defective product and asked for exchange. No reply after 6 e mails. I asked questions if this was normal and if I should plug it back in again. No reply. I plugged it back in and car started. One time. Now my car will no longer start. Do not buy anything from these people. They have no customer service and their product will ruin your car. I believe I will have to have my existing chip reprogrammed now, who knows how much that will cost. I imagine. A lot