Learn How To Erase Key Fob Memory? [ Explained & Solved]

By: James Diaz | August 5, 2022

How To Erase Key Fob Memory

If you’ve ever had to give a key fob to someone else, you know the feeling of dread that comes with hoping they won’t be able to access your car. But what if you’ve shared your key fob with too many people, and now you can’t remember who has access? 

Is there anything to do then? Sure, there is something for you!

  • If your key fob has a button that says “Erase” or “Clear,” press and holds it for about 20 seconds. This will erase the key fob’s memory and disable any programmed keys.
  • If it doesn’t have an “Erase” button, you can usually erase its memory by removing the battery for about 20 seconds. 
  • After you reinstall the battery, your key fob should be erased and ready to be programmed with new keys.

Here I will show on how to erase Key Fob memory so that no one can get into your car without your permission.

What Is a Key Fob?


What Is a Key Fob?

A key fob is a small device that typically contains a button or two, which can be used to activate a variety of functions on your car. For example, you can use a key fob to lock and unlock your car doors or to activate the panic alarm. Some key fobs also allow you to start your car’s engine remotely, which can be handy if you want to warm up your car on a cold day.

Most key fobs are battery-operated and will need to be replaced periodically. Some newer cars also have keyless entry systems that don’t use a key fob; instead, they rely on a transponder chip in your car key itself.

What Is Erasing A Key From Your Car Memory? 

When you erase a key from your car memory, you can no longer use that key to start the car. This is often done when a key is lost or stolen, as it prevents someone from using the key to steal your car.

If you have more than one key, you can erase all the keys from your car’s memory or just one key. To erase a key, you will need to have the car’s key fob with you. If you do not have the key fob, you will not be able to erase the key.

How To Erase Key Fob Memory?

Using a key fob can be a convenient way to access your car, but if you lose it or it gets stolen, you’ll need to erase the memory so that no one else can use it. 

Here are some steps to take to erase the key fob memory:

  1. Find the right tools. To erase the key fob memory, you’ll need a special eraser tool and a blank key.
  2. Insert the key into the ignition.
  3. Turn on the car’s power. This will allow the eraser tool to access the key fob’s memory.
  4. Place the eraser tool against the key fob.
  5. Press and hold the button on the eraser tool.
  6. Wait for the tool to erase the key fob’s memory.
  7. 7. Remove the key from the ignition and insert the blank key into the car’s ignition.
  8. Turn on the car’s power to test the new key.

These steps can erase the key fob memory and keep your car safe.

Can You Reprogram A Used Key Fob To A Different Car?

It is possible to reprogram a used key fob to a different car. However, the process may vary depending on the make and model of the car. It is advisable to consult the car’s owner manual or a certified automotive locksmith for instructions on how to do this.

Reprogramming a key fob to a different car involves resetting the device to be paired with the new car’s system. This can be done by pressing a button on the key fob or using a special code. Once the key fob is reset, it can be used with the new car.

It is important to note that not all key fobs can be reprogrammed. Some models may only be able to be used with the car they were originally paired with. Additionally, reprogramming a key fob may void the warranty.

How To Reprogram A Ford Key Fob?

If you recently lost or damaged your Ford key fob, you may wonder how to reprogram it. Although it may seem daunting, reprogramming your key fob is simple and can be done in a few easy steps.

What You Will Need:

  • A working key fob
  • A Phillips head screwdriver
  • A paperclip or safety pin


  1. Start by locating the small hole on the back of your key fob. This is usually located near the bottom of the fob.
  2. Once you have located the hole, insert the paperclip or safety pin into it and press down. This will release the battery cover.
  3. Remove the battery cover and take out the old battery. Then, insert a new CR2032 battery into the key fob.
  4. Once the new battery is in place, replace the battery cover and screw it back on.
  5. Press and hold the lock and unlock buttons on your key fob for approximately 20 seconds. This will reprogram the key fob.

How Do You Reprogram A Nissan Key Fob Push Start?

If you have a Nissan with a push start, you may be wondering how to reprogram the key fob. Here are some instructions:

  • Firstly, you will need to find the appropriate OBD-II port for your Nissan. This is usually located under the dash, near the steering column.
  • Once you have located the port, insert the key fob into the port and turn it to the ON position.
  • Next, press and hold the button on the key fob for approximately five seconds.
  • After five seconds, release the button and press it for three seconds.
  • Finally, remove the key fob from the port, and your Nissan should now be reprogrammed!

How To Program A Dodge Key Fob?

How To Program A Dodge Key Fob?

Dodge key fobs are easy to program, and you can do it yourself. Here’s how:

  • Sit in the driver’s seat of your Dodge vehicle with the doors closed.
  • Insert the key into the ignition and turn it to the “On” position.
  • Press and release the “Lock” button on the key fob.
  • Within five seconds, press and hold the “Lock” button again.
  • Within 10 seconds, press and release the “Panic” button on the key fob.
  • You should see the doors lock and then unlock, indicating that the key fob has been programmed.

What To Do If You Lose Your Key Fob?

What To Do If You Lose Your Key Fob?

If you lose your key fob, don’t panic. You can do a few things to get back into your car and get on your way.

First, check to see if you have a spare key. If you do, great! If not, you’ll need to call a locksmith or tow truck to get into your car.

If you have a spare key, but it’s not working, try these steps:

  • Check the battery. If the battery is dead, replace it and try again.
  • If the spare key is still not working, the transponder in the key fob may be damaged. In this case, you’ll need to get a new key fob from the dealership.

If you don’t have a spare key and need to call a locksmith or tow truck, be prepared to pay a hefty fee. The average cost of a locksmith is $75-100, and the average cost of a tow truck is $50-75.

How To Remove Key Fob Battery And It Cover?

There are a few reasons why you might need to remove the key fob battery and its cover. Maybe the battery is dead and needs to be replaced, or maybe the key fob is not working properly, and you need to troubleshoot the issue.

In any case, it is relatively easy to remove the key fob battery and its cover. Here are the steps you need to follow:

  • Locate the small hole on the back of the key fob. This is usually located near the bottom of the key fob.
  • Insert a small tool, such as a paperclip, into the hole.
  • Push the paperclip until you feel it engage with the battery release mechanism.
  • Hold the paperclip in place and push the key fob cover away from the body of the key fob.
  • The cover should come off easily, revealing the battery inside.
  • To remove the battery, pull it out of the key fob. Once the battery is removed, you can put the cover back on and reassemble the key fob.

If you need to replace the key fob, use a CR2032 coin cell battery. This is the most common type of battery used in key fobs and is readily available at most stores.

How Much Does It Cost To Reset A Key Fob?

Key fobs are an important part of many modern cars. They allow you to remotely lock and unlock your doors, as well as start the engine. If your key fob becomes damaged or lost, it can be a major inconvenience.

Fortunately, there are a few different options available for resetting or replacing your key fob. The cost will vary depending on the make and model of your car as well as the type of key fob.

The average cost to reset a key fob is between $50 and $100. However, this price can vary depending on the make and model of your car as well as the type of key fob.

If you have a standard key fob, it may only need to be reprogrammed. This can usually be done by your local dealership or auto locksmith. If you have a more sophisticated key fob, such as one with a built-in transponder, you may need to replace the entire unit. This can be more expensive, typically costing between $100 and $250.

People Often Ask More

Can you Un program a key fob?

If you’ve misplaced your key fob, it may be wiped clean. When another person picks up the key fob, this will prohibit them from using it. It’s important to follow the instructions carefully since various security systems have different procedures for erasing the key fob.

Can a used key fob be reprogrammed?

A key fob may be reprogrammed to another car as long as the vehicle’s key is the same as the fob’s. Here are the steps needed to perform the following if your key can go inside the doors and open them: The battery in the key fob should be removed and replaced.

When you program a new key fob, does the old one still work?

If one is lost or stolen, the device should be able to be disabled without the owner being there. This is something the dealer can do. To reprogram the car, remove any previously programmed keys (keys do not need to be present at the time).

Why is my car not detecting my key fob?

Failing to transmit signals to an automatic door lock might be caused by a dead battery in the key fob or other factors. If you have one, open the car using the spare key fob, and turn the ignition on. Using the given key contained in the fob to open the door if a spare fob is not available is recommended.

Can I program a car key myself?

There is no way to transfer a remote control from one automobile to another, even if they are the same make and model. Changing a key in a modern vehicle will almost certainly be impossible without the assistance of a professional. Visit a shop or the local locksmith.

How long does it take to program a key fob?

Key-fob programming normally takes between 15 and 30 minutes, and cutting a mechanical replacement key seldom takes more than an hour, according to most dealers we contacted. Even if the dealer handles everything for you, going to them doesn’t have to be expensive.

Can you program a chip key yourself?

You don’t need an expert transponder key programmer to assist you in programming your transponder. As long as you follow the correct steps, you should be able to do this on your own. Your car’s kind affects the programming procedure, which isn’t difficult.

Concluding Remarks

Now you are clear with “how to erase key fob memory.” Key fobs are a convenient way to lock and unlock your car, but what happens when you lose them? 

If you can’t find your key fob, the best thing to do is erase the memory so that no one can access your car. Here are three tips for erasing key fob memory.  

1) Remove the battery

2) Use a magnet

3) Hold down the buttons on the key fob.

All of these methods will erase the key fob’s memory, allowing you to start fresh with a new key fob. Remember, it’s important to erase the memory of your lost or stolen key fob so that no one can gain access to your vehicle.


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