2019 Tesla Model 3 Key Fob Programming Guide

Unlike traditional cars that require complex procedures or a trip to the dealer, Tesla has made adding a new key fob to your 2019 Model 3 a straightforward, do-it-yourself process that you can complete in minutes right from the driver's seat. This guide will walk you through the on-board programming steps, battery replacement, and your options for purchasing a new fob.

Quick reference

Step-by-step on-board programming

Programming a new key fob for a 2019 Tesla Model 3 is done entirely through the vehicle's center touchscreen. The only prerequisite is that you must have at least one existing, functional key (either a key card or another key fob) to authenticate the new one.

If you have lost all your keys, you cannot use this procedure and must contact Tesla Service.

Here are the steps:

1. Enter Your Vehicle: Sit in the driver's seat with your existing, authenticated key card or key fob. It's a good idea to close the driver's door.

2. Navigate to the Locks Menu: On the main touchscreen, tap the car icon in the bottom-left corner to bring up the Controls menu. Then, select the Locks tab.

3. Begin Adding a Key: You will see a list of currently paired keys. At the top of this list, tap the + icon to add a new key.

4. Place the New Fob: The screen will now instruct you to place your new, unpaired key fob in the designated area on the center console. This spot is located just behind the two front cup holders.

5. Authenticate with an Existing Key: After the car detects the new fob, it will prompt you to authenticate the pairing using one of your existing keys. Place your original key card or a previously paired key fob on the same center console spot to confirm.

6. Confirmation: The screen will display a message confirming that the new key has been successfully paired. The new fob will now appear in your list of keys.

7. Test the New Fob: Before you put your tools away, test all the functions of the new key fob. Press the lock, unlock, front trunk (frunk), and rear trunk buttons to ensure everything works as expected. Also, test the passive entry by walking away from and back to the car with the fob.

Battery replacement

The Model 3 key fob uses a single CR2025 battery. If you notice reduced range or intermittent function, it's likely time for a replacement.

1. Place the key fob button-side down on a soft, clean surface to avoid scratches.
2. Using a small, flat tool like a spudger or a tiny flathead screwdriver, carefully insert it into the small seam on the bottom edge of the fob and gently pry the bottom cover off.
3. The battery will be visible inside. Carefully lift and remove the old CR2025 battery.
4. Insert the new CR2025 battery with the positive (+) side facing up.
5. Align the bottom cover and press it firmly back into place until you hear it snap shut, ensuring a tight seal all around.

Where to buy a replacement fob

• Tesla Service Center or Mobile Service (Recommended): This is the most reliable and guaranteed method. You can purchase a genuine OEM key fob directly from Tesla for approximately $150 - $175. You can then easily program it yourself using the steps above. If you are not comfortable doing it yourself, Tesla Mobile Service can come to you and perform the pairing for an additional labor fee.

• Automotive Locksmith: Some specialized automotive locksmiths have the equipment to work with Tesla vehicles. However, they are less common than those who work on traditional brands. If considering a locksmith, always call ahead and explicitly confirm they can source and program a fob for a 2019 Model 3. Costs may be comparable to the dealer.

• Amazon, eBay, etc. (Not Recommended): We strongly advise against purchasing key fobs from third-party online marketplaces. Many of these are used fobs that are still locked to a previous vehicle, making them impossible to program to your car. Others are low-quality clones that fail quickly. Given the simple DIY programming, it's best to spend a little more for a genuine fob from Tesla.

If on-board programming isn't supported

The only scenario where on-board programming isn't an option is if you have an "all keys lost" situation. Because the system requires an existing, authenticated key to approve the addition of a new one, you cannot program a new key if you have no working keys at all.

In this case, your only recourse is to contact Tesla Service. You will need to provide proof of ownership (title, registration, ID). Tesla will then use their proprietary diagnostic software to securely access the vehicle's immobilizer system and program a new set of keys. This is a security-critical procedure and is significantly more expensive than simply adding a key, often costing several hundred dollars.

Find a mobile locksmith or shop on Repairius.