How to Replace a Lost Car Key

Losing your car keys could be a huge trouble. lost vehicle key is calling your local locksmith or dealer. To create a replacement key, they'll require proof of ownership and the original key.

However, this is not always the most cost-effective way to go.

Traditional Keys

Metal keys for cars were the most common. They have grooves on both sides that fit into a matching set of slots in the ignition. The key would then be placed into the cylinder for ignition and turned to turn off the car. If you have lost a traditional key it can cost less than other keys to replace them.

You can call an auto locksmith to have a brand new traditional key made while you wait. The locksmith will require the make, model and year of your vehicle. The locksmith may also need proof of ownership to confirm your right to purchase a key.

Transponder keys are more prevalent in vehicles that are newer. These are a bit more expensive to replace than traditional keys, but they're also more safe from theft. The plastic head of a transponder key has an electronic chip that communicates with your car's computer system, ensuring that only the right key is able to start it.

When a car is sold, the chips inside transponder keys will be programmed with a code. Some of them use 'rolling codes' which send an entirely different code each time it's used, making it hard for thieves to duplicate them. If you own a modern vehicle that has a transponder keys it is recommended to keep it in a secure location.

Transponder keys have a greater lifespan than traditional metal keys, however they are more expensive to replace in the event that you lose them. You'll have to contact your dealer to request an alternate transponder key should you lose one. You'll have to provide your VIN (a 17-digit number) which tells the dealer which car it's compatible with.

You will also need to provide the serial number of your car. This number can be found on a sticker placed on the driver's side door, or the owner's manual. It is important to keep these numbers in your car because they will help you locate your car if it is stolen or lost.

Transponder Keys

If you own a car manufactured in the last 20 years or so it is likely that your car's key has transponder chips. These tiny pieces of technology are programmed specifically for your specific car, so only you can use it. Your transmission will be locked on your vehicle if it senses the key doesn't match the code. This is to ensure that only the owner has the right to start the vehicle.

These keys are a great feature for your car as they deter theft of cars. Hot wiring is a method that thieves have used to get cars started. However, when cars began using transponder chips it became more difficult to steal them as the criminal must have the correct key to transmit the signal required to start your car.

Luckily, if you have an old-fashioned key and lose it, a local locksmith can cut you a brand new one on the spot and remove the old one from your vehicle's system. On the other side, if you own an electronic transponder or fob key, then you will be required to visit the dealership to have it replaced. This is because the dealer needs to know your VIN (Vehicle Identification Number) in order to order the right key for your vehicle.

This is because they be required to verify that the key that they're requesting for you is paired with your particular vehicle to be able to start it and unlock your doors. You'll also need to show evidence of ownership such as your registration or title to get the replacement key from the dealership. This kind of replacement might be a bit more expensive, but it's well worth it if you think about the possibility that your vehicle key was stolen. If you're worried about the expense, you should check whether your warranty or insurance will cover the cost. If not, you'll need to take your car to the dealer to have it towed. You can also get the key from the manufacturer.

Fob Keys

The latest type of car keys are designed to function as remotes, allowing motorists to open the doors and start the engine without having to insert traditional keys into the ignition. These keys are also referred to as keyless entry keys or remote control keys and are typically cheaper to replace than older, more traditional versions. They're not completely safe, but neither are any other consumer electronics. They are also susceptible to theft and stop working when they are moved around in your pocket or bag.

Fobs emit a digital code that allows drivers to open and start their car. When tapped against a sensor inside the car, it reads that code and allows the doors to open and the engine to begin. Some fobs have additional features, such as a button that summons the car (similar to the Tesla summon feature).

If you have lost your key fob, make sure that your keys aren't in a purse or bag that is locked. Then, if they are not in your possession, look through your day and consider where you may have lost the keys. You can also check your pockets, any bags you might have, or on surfaces such as counters and other surfaces. You might be able to locate your keys in the place you put them, or where you placed them when you went to buy something.

You can purchase replacement key fobs online, but they must be programmed to work with your particular vehicle. Some, like those used by Audi and Subaru need a trip to the dealership to have them reprogrammed to your particular key. The good news is that roadside assistance companies such as AAA will often assist with this, too.

If you do decide to purchase a new key fob, comparison shop. Some retailers will program and cut a fob bought elsewhere for less than for the same thing at the dealer. Some key fobs can be replaced using only the outer shell leaving the electronics in good in good working order. Check your car insurance policy or auto club membership to determine whether you have coverage that covers this.

Keys with chips Keys

Cars have gotten more and more technologically advanced over the years, which has lead to more sophisticated car keys. These newer keys cannot be duplicated by locksmiths. They require a specific machine. It can be more expensive to replace keys that are lost in the car with a chip.


If you lose your transponder chip or it is stolen from you, then you will need to contact the local dealership to request an exchange. This is because they have a record of your security information and can match the new chip with your vehicle without hassle. The process can take a few days, however, as the dealer must obtain the key from the manufacturer, and it could take some time to receive it.

The good news is that it's possible to have a duplicate made for your transponder chip by a professional locksmith. The process is a bit more complex than going to the dealership however it will save you lots of money in the long run. You'll need your car's VIN number to get an additional copy. This number can be found on your insurance policy or the sticker in the jamb of the driver's door.

You'll need to bring a duplicate of the old key with you. This way, the locksmith will be able to match the key cuts. If you're unable to locate your old key, look in the trunk and other places where it could be hidden. Examine your bags and pockets. You don't know if you put your keys somewhere, or if you accidentally knocked them out of your bag when reaching for something else.

It is imperative to immediately start looking for your car keys if you are unable to locate them. First, ensure that you didn't leave them at home or at the office. After that, take a look over your day to determine if they might have been misplaced. After you've cleaned all your pockets and checked all of your bags, it's time to move on to more advanced search techniques.