I have a car with only 1 key but it worked fine. I met the Car Keys Express technician at the Nissan dealer near me to get additional keys. The technician worked on my vehicle. When he was done neither the original or replacement key he made would work in the vehicle. I had to leave the vehicle at the Nissan dealer for a week and cost me $1200. Car keys express would not respond until in sent them 2 certified letters and then they refused to reimburse me for damaging my car. Very unethical company and leadership. Kevin Leamy is the company representative that I dealt with. He is unethical and has no integrity and would not accept any responsibility for damaging my car.