Replacements, programming guides, push-to-start fobs, and accessories — for every make and model.
A car key fob is a small wireless remote that uses radio-frequency (RF) signals — typically at 315 MHz (US) or 433 MHz (Europe) — to lock, unlock, and sometimes start your vehicle from a distance. When your fob stops working or is lost, you can replace it yourself for $15–$60 using a compatible aftermarket fob and a free programming procedure, instead of paying a dealer $200–$500.
Step-by-step DIY guide for 20+ car brands. No tools required for most vehicles.
Top-rated aftermarket fobs by car brand, with affiliate pricing and compatibility info.
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Your car fob contains a small radio transmitter that sends a unique encrypted signal to a receiver module in your vehicle. When you press Lock or Unlock, the fob broadcasts a code on its assigned frequency. The car's receiver matches the code and acts accordingly. Modern fobs use rolling codes — the code changes with every press — making them very difficult to clone or replay.
| Method | Fob Cost | Programming Cost | Total Est. | Time |
|---|---|---|---|---|
| Dealer | $150–$350 | $50–$150 | $200–$500 | 1–3 days |
| Locksmith | $50–$150 | $50–$100 | $100–$250 | Same day |
| DIY (self-programming fob) | $15–$60 | Free | $15–$60 Best | 10 minutes |
→ Full DIY programming guide with step-by-step instructions