“If you have a car that was built within the last five years, a new-car dealer will usually be your best bet when you need a replacement key fob, due to the expensive programming equipment that is required,” says John Ibbotson, CR’s chief mechanic.Īlthough it might be tempting to search for a cheaper key fob online, we learned from Audi and Subaru dealers that some won't work with aftermarket key fobs.