for 2002 and up Explorer, there is 2 ways to get the code. The easiest is to go to the dealer, put it on the scanner and pull the code. Some dealers charge $40, some do it for free. The 2nd is to get the code of the box which is in the passenger c pillar for 02 and up, not under the hood. The c pillar is the one by the back seat, and a bit tricky to remove the trim if you don't know what you're doing. If you want to try it, you need to remove the top trim piece, fold the back seat and pull the bottom trim piece enough to see the black box with a white label. The larger 5 digit code is the one you're looking for.