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If your car key shell is cracked, worn, or the buttons no longer press properly, replacing it with a new shell is often the most affordable and effective solution. But one major challenge stands in the way: figuring out exactly which replacement shell you need. With so many variations in blade types, button layouts, and internal compatibility, it’s easy to buy the wrong part—and waste both time and money.

This guide breaks down how to identify the correct key shell for your car, so you can upgrade or replace your damaged remote housing without confusion.

 

Step 1: Identify Your Key Blade Type

One of the most important features is the key blade. Even within the same car brand, different models and years may use different blade types. Two of the most common are:

HU83 blade – Used by many Peugeot and Citroën models. It has a curved groove on both sides.

VA2 blade – Similar in appearance but has a flat groove instead of a curve.

Other types include TOY43, TOY47, and SIP22, often used in Toyota, Fiat, and other manufacturers. If you're unsure, comparing your blade side-by-side with online reference images helps avoid errors.

Tip: Never rely only on the number of buttons—focus on the blade profile first.

 

Step 2: Count and Match the Button Layout

Next, verify how many buttons your original key has, and in what layout. Common options include:

2 buttons: Lock / Unlock

3 buttons: Lock / Unlock / Trunk

Smart keys: May have a more complex layout or hidden emergency blade

Even a small difference in layout can prevent the rubber buttons from pressing the internal switches correctly.

Also check whether the button pad is integrated into the case or if it’s a separate piece. That may affect your fit.

 

Step 3: Check the Internal Electronics Placement

When swapping a shell, you’ll be transferring the circuit board and (in most cases) a transponder chip. The replacement case must have:

The same mounting points and slots

Space for the battery (check if yours is CR1620, CR2032, etc.)

A similar design to support the flip mechanism, if your original key has one

If the internal layout doesn’t match, your circuit board may not sit securely—or your buttons may not work.

Bonus tip: Open your old key carefully and take photos of the internal structure before ordering a shell.

 

Step 4: Consider the Key Type – Flip or Fixed

There are two main styles:

Flip keys: Blade folds into the case and pops out with a button press

Fixed blade keys: Blade is static and exposed

You must match your replacement with the original style, unless you're intentionally upgrading. Flip key conversions are popular, but they require extra parts and a bit more installation effort.

 

Step 5: Check the Model Compatibility List

Many key shells are marketed as being compatible with a range of car models. Look for a list that includes:

Your vehicle’s make and model

The production years (e.g., “Peugeot 207 2010–2014”)

Even then, cross-reference with your physical key—models change subtly across production years.

 

Step 6: Know What You're Not Getting

A replacement key shell typically does not include:

The circuit board (you must transfer it from your old key)

The transponder chip

A pre-cut blade (unless stated)

You’ll likely need to cut the new blade or reuse the old one if it's detachable.

 

Choosing the right replacement key shell doesn't have to be trial and error. By focusing on blade type, button layout, and internal structure, you can confidently find a case that fits your needs—and your key electronics.

It’s a simple fix that extends the life of your existing key without the cost of a full replacement. Just take your time, check the details, and match your original key carefully.

A few minutes of inspection now can save hours of hassle later.

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Upgrading your car key can significantly improve your vehicle’s security and make your daily routine more convenient. Whether you’re upgrading from a basic key to a remote key or stepping up to a smart key, this guide will take you through the entire process, step by step, ensuring a smooth transition. Understanding Your Key Type Before you start the upgrade process, it’s important to know which type of key you currently have. Here are the most common key types: Traditional Metal Keys : These are basic, mechanical keys, common in older vehicles. They don’t have any electronic components. Transponder Keys : These have an electronic chip inside the key head that communicates with the vehicle’s computer system for added security. Remote Keys : These keys have buttons to lock/unlock the doors remotely and usually have a physical blade as a backup. Understanding your current key type will help guide your decision on the best upgrade path. Choosing the Right Upgrade Once you know what type of key you have, you need to decide what features you want in your upgraded key. Some options to consider are: Remote Locking : Allows you to lock/unlock the doors from a distance. Keyless Entry : Lets you unlock the car without taking the key out of your pocket. Smart Key : Offers advanced functions such as proximity unlocking, push-button start, and remote engine start. Take some time to research the options available for your specific car model. Many car manufacturers offer compatible upgrades for different key types, so it’s important to consult your dealership or a trusted locksmith for recommendations. Gathering What You’ll Need Before starting the upgrade process, make sure you have the following materials: The New Key : This could be a transponder key, remote key, or smart key. Your Original Key : You’ll need this as a reference throughout the process. Key Programming Device : Some keys require a special device to pair the key with your car. Car Manual or Programming Guide : It’s always a good idea to have your car’s manual handy for specific instructions. Having everything ready will make the process much smoother. Step-by-Step Upgrade Process Purchase the New Key Start by purchasing your new key. You can buy it from your car’s dealership, a certified locksmith, or a trusted online retailer. Make sure that the key is compatible with your vehicle’s make and model. Transfer Electronics (if necessary) If your new key is just a shell, you will need to transfer the internal components from your old key. This includes the transponder chip and, if applicable, the key blade. Be careful when transferring the electronics to avoid any damage. Program the Key Programming the new key is crucial for it to work with your vehicle. Here’s a general guide: Insert the original key into the ignition and turn it to the ON position. Quickly remove the original key and insert the new key. Turn the new key to the ON position and wait for the security light to turn off. This might take a few minutes. Test the New Key After programming, it’s important to test the new key to ensure everything works properly. Check the following functions: Locking and unlocking the doors Starting the engine Any additional functions like remote trunk opening or proximity unlocking Troubleshooting Common Issues If your new key isn’t working as expected, don’t worry! Here are some common problems and their solutions: Key Not Recognized : Check if the transponder chip is properly placed in the key. Key Doesn’t Start the Car : Double-check the programming steps to ensure everything was done correctly. Buttons Don’t Work : Verify that the battery in the new key is properly installed and functional. If the problem persists, it’s best to consult a professional locksmith or visit your dealership for further assistance. Upgrading your car key is an excellent way to improve both the security and convenience of your vehicle. By following these steps, you’ll be able to transition smoothly to your new key. If you run into any issues, don’t hesitate to reach out to a professional locksmith who can help you along the way. Enjoy the benefits of your new car key and the added peace of mind that comes with enhanced security.

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