Owner holding the two keys of a used SUV after Míster Keys erased and reprogrammed them

Used Car Key Security: Key Erase & Reprogramming

When you buy a used car, you don't know how many keys are out there. We erase every old key from the car's memory and program only the ones you hold.

Used Car Key Security

How We Help

When you buy a used car, the seller hands you one or two keys — but the car may remember more. Previous owners, family members, valets or a dealership could still have a key that opens and starts your vehicle, and you would never know.

We connect to the car, check how many keys are registered and erase all of them. Then we reprogram only the keys in your hand. From that moment, any other key that exists simply stops starting the car.

Our recommended 3-step check

  • Know that you have 2 keys
  • Confirm the keys registered in the vehicle are exactly those 2 keys
  • Make sure the door lock opens with your key

Book This Service

Tell us what happened and where the car is. After you send it, you can continue the conversation on WhatsApp.

Urgent? Call (917) 531-6755 — we answer 24/7.

Owner holding the two keys of a used SUV after Míster Keys erased and reprogrammed them

Your Car, Only Your Keys

It is a small step that gives you full control of who can drive your car. It is especially important for cars bought from private sellers, auctions or lots where the key history is unknown.

If you only received one key, we can make the second one during the same visit so you are never left without a spare.

(917) 531-6755
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FAQ

Common Questions

Why should I erase the old keys of a used car?

Because you can't know how many keys were made for the car. Erasing them and reprogramming only yours means no one else can start your vehicle.

Can you tell me how many keys are registered in my car?

On most vehicles, yes. Our programming equipment reads the number of keys stored in the car before we erase them.

I only got one key with the car. Can you make another?

Yes. We can program a second key during the same visit, so you leave with two working keys and no unknown ones.

Where We Offer This Service

We provide used car key security: key erase & reprogramming in every area we cover. Some of the places where drivers call us most for it:

See all service areas →

Other Services

Ignition Switch & Door Cylinder Repair

Key won't turn, ignition stuck or a door lock that stopped working? We repair or replace ignition switches and door cylinders on site.

See service

Lost Car Key Programming & Replacement

Lost every key to your car? We cut and program a brand-new key on site — all makes, including chip keys and smart keys.

See service

Key Duplication & Spare Keys

Only have one key? Get a spare before it becomes an emergency — regular keys, chip keys, flip keys and smart keys.

See service

ECU / Module Programming & Key Cloning

Immobilizer, BCM and key-module programming plus key cloning, done with professional diagnostic equipment.

See service

Locked Out or Lost Your Keys?

Call or send a WhatsApp now. We come to you, 24 hours a day, 7 days a week.