2020 Subaru Forester Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Unfortunately, the 2020 Subaru Forester does not support on-board (DIY) programming for new key fobs. This is because modern Subaru vehicles, including this model year, are equipped with a sophisticated immobilizer system that requires specialized diagnostic tools for key registration.

To program a new key fob, you will need to contact a Subaru dealership or a qualified automotive locksmith. They will use a scan tool that connects to the vehicle's OBD-II port to register the new key with the car's computer. This process ensures that only authorized keys can start the vehicle, providing a high level of security.

Battery replacement

Replacing the battery in your 2020 Forester key fob is a simple task you can do at home.

1. Release the emergency key: Press the small silver button on the back of the fob to release the internal metal key blade.
2. Open the case: Use the emergency key or a small flathead screwdriver to carefully pry the two halves of the fob apart. There is a small indentation where the key came out that you can use for leverage.
3. Remove the old battery: The fob will open up, revealing the internal circuit board and the CR2032 coin battery. Note the orientation of the battery before removing it.
4. Insert the new battery: Place the new CR2032 battery into the holder, ensuring the positive (+) side is facing up, just like the one you removed.
5. Reassemble the fob: Snap the two halves of the key fob back together until they click firmly in place.
6. Test the fob: Test the lock, unlock, and other functions to ensure the new battery is working correctly.

Where to buy a replacement fob

• Subaru Dealership: This is often the most expensive option, with prices for a new fob and programming potentially reaching several hundred dollars. However, you are guaranteed to get a genuine OEM part.
• Automotive Locksmith: A professional locksmith can typically source a new OEM or high-quality aftermarket fob and program it to your vehicle for a lower cost than the dealership. They have the necessary tools and expertise to handle the immobilizer system.
• Online Retailers (Amazon, eBay, etc.): You can find a wide variety of aftermarket fobs online, often at a significant discount. Be cautious and purchase from reputable sellers. While you might save money on the hardware, you will still need to have the fob programmed by a locksmith or dealer, as DIY programming is not possible.

If on-board programming isn't supported

As mentioned, the 2020 Forester requires a professional with a diagnostic scan tool to program new keys. This is due to the transponder chip inside the key fob that communicates with the vehicle's immobilizer system. When a new key is programmed, the tool registers the unique code of the transponder with the car's computer. If the car does not recognize the code from the key attempting to start it, the engine will not turn over. This system prevents vehicle theft.

Expect to pay between $150 and $400 for a new key fob and programming, depending on whether you go to a dealership or a locksmith and whether you choose an OEM or aftermarket part.

Find a mobile locksmith or shop on Repairius.