What Does It Mean to Rekey a Car Lock?
Rekeying a car lock is the process of changing the internal wafers inside the cylinder so that old keys no longer work and a brand-new key takes over. The lock itself stays. Only the key changes.
This is the same concept as rekeying a house lock, but applied to a car. The wafers (the little spring-loaded tabs inside the cylinder) are removed and re-arranged or replaced so they match a new key cut, and the old key won't move them anymore.
When Should You Rekey Your Car?
- You just bought a used car. The previous owner might still have a key. The dealer might have given a copy to a salesperson. Old service technicians might have copies. Rekeying makes all of those useless.
- You suspect a key is "out there." Lost a key six months ago in a parking lot? It might still be in someone's pocket. Rekey and stop worrying.
- You went through a separation or divorce. Sometimes you just want a clean break that doesn't involve asking for the key back.
- An employee or borrower had access. Service person, family member, ex-roommate — anyone who had a key during a period you no longer trust.
- After a recovered theft. If your car was stolen and recovered, you don't know if a copy was made before recovery.
- To re-establish "one key for everything." Older cars sometimes have mismatched keys (door key different from ignition key). We can rekey all the cylinders to operate on a single key.
Rekey vs. New Key vs. New Lock
- Rekey — The lock cylinder stays. Old keys stop working. New key is required. Done on-site, no parts replacement.
- Replacement key — Just makes another working copy of the existing key. Doesn't change what works on the car — the old key still functions if found.
- New lock cylinder — Full hardware replacement. More expensive, more involved. Necessary only if the cylinder itself is broken or worn out.
What Gets Rekeyed
- Driver's door lock cylinder — The one you use most
- Passenger door lock cylinder — Often forgotten but important — old keys still work it otherwise
- Trunk / liftgate lock cylinder (when present as a separate keyed lock)
- Ignition cylinder — The one that actually matters for starting the car
- Glovebox or center console locks if equipped
Important note: rekeying changes the mechanical key cut, but does NOT deactivate transponder chips or smart key proximity functions. If someone has a programmed transponder key, rekeying the door cylinders won't stop their chip from starting the engine on a push-to-start car. For comprehensive security on modern vehicles, rekey the cylinders and also reprogram the immobilizer to deactivate any unknown keys. We do both. Call (253) 796-8550.
