Taking your key to a local hardware store, automotive locksmith or car dealership is a good idea if you want to find out if your key has a transponder chip inside of it. If you have a spare key that you made from a blank, then you can try to start the car with this simple metal key. If it only opens the doors and the trunk but doesn’t start the car, then you can be assured that your car key probably has a transponder key inside. A good way to know if your key has a chip is by examining it. If the key has some plastic casing around the large part of the key, you know, the part that doesn’t go fully into the lock, chances are your key might just have a chip.