Car Key Guides

Plain explanations of how car keys, fobs and immobilizers actually work — what each type of key is, what a replacement involves, and what’s worth checking yourself before anything else.

• Who Can Replace a Car KeyWhat parts stores, kiosks, hardware chains and dealers can each actually do.
• Car Key Replacement CostThe five things that move the number.
• Car Key ImmobilizerThe system that decides whether your engine starts.
• Transponder KeysThe chip, and why cloning isn’t programming.
• Smart / Proximity KeysThe key that needs a battery.
• Broken Key ExtractionWhat works at home and what makes it worse.
• Key Fob BatteryHow to tell it’s the battery, and how to change it yourself.
• Keyless Car TheftWhere to keep your keys, and whether Faraday pouches actually work.
• Ignition Switch SymptomsWhich of four parts is actually failing — and which a locksmith fixes.