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Programming a new Toyota key fob yourself works for many models built through about 2010, but newer Toyotas typically require a dealer or automotive locksmith with specialized scan tools. The deciding factor is your vehicle’s model year and whether the system uses transponder immobilizer logic that must be synced through the OBD2 port. If you…

You can program a new Honda key fob yourself on most models built between 2003 and roughly 2020, provided you already have at least one working fob. The procedure is a timed ignition-and-button sequence that requires no special tools. However, the counter-intuitive catch is that Honda systems typically cap stored fobs at three—so if your…