2018 Subaru Crosstrek Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Unfortunately, the 2018 Subaru Crosstrek does not support DIY on-board key fob programming. This means you cannot program a new key fob yourself using a series of ignition cycles or button presses.

The immobilizer system in your Crosstrek requires specialized diagnostic equipment to program new key fobs. This equipment is typically only available to authorized Subaru dealerships and automotive locksmiths. They will connect a scan tool to your vehicle's OBD-II port to add new key fob data to the car's computer.

Attempting to program a key fob without the correct equipment can lead to issues with your vehicle's security system and potentially render the fob unusable. It is crucial to use a professional for this service.

Battery replacement

1. Locate the small release button or tab on the side of the key fob. Press it to release the emergency key blade and pull it out.
2. With the emergency key removed, you will see a small slot or indentation. Carefully insert a small flat-head screwdriver or a coin into this slot.
3. Gently twist the screwdriver or coin to pry open the two halves of the key fob case. Be careful not to damage the internal components.
4. Once open, locate the CR2032 coin cell battery. Note its polarity (which way the positive (+) side is facing).
5. Gently pry out the old battery and insert the new CR2032 battery with the correct polarity.
6. Align the two halves of the key fob case and press them firmly together until they snap shut.
7. Reinsert the emergency key blade.

Where to buy a replacement fob

• Subaru Dealership:

  • Pros: Guaranteed genuine OEM part, professional programming service, warranty. You'll receive a key and remote that are designed specifically for your vehicle and will function perfectly.
  • Cons: Most expensive option. A new OEM key fob and programming can cost anywhere from $200 to $400 or more, not including the cutting of the integrated key blade.

• Automotive Locksmith:

  • Pros: Often more affordable than a dealership, can provide both OEM and quality aftermarket fobs, and typically offer mobile services (they come to you). They have the specialized tools to program the key fob and cut the key blade on-site.
  • Cons: Prices can vary, ensure the locksmith is reputable and experienced with Subaru systems. Expect to pay between $150 and $300 for a new fob, cutting, and programming.

• Online Retailers (e.g., Amazon, eBay):

  • Pros: Potentially the cheapest option for the key fob itself. You can find both OEM and aftermarket options.
  • Cons: You're only buying the physical fob; you'll still need to pay a locksmith or dealer to cut the emergency key blade and program the transponder and remote functions. Beware of counterfeit or low-quality aftermarket fobs that may not work correctly or last long. The total cost, including professional services, might approach or even exceed a locksmith's all-inclusive price, especially if you buy a fob that ends up being incompatible.

If on-board programming isn't supported

As established, the 2018 Subaru Crosstrek requires specialized equipment for key fob programming. This is due to the advanced immobilizer system that prevents the car from starting if an unprogrammed key is used. The key fob contains a transponder chip (often a Texas Instruments 4D-60 or similar) that communicates with the car's immobilizer antenna in the ignition or smart access system.

When a new key fob is programmed, its unique transponder ID is registered with the vehicle's immobilizer control module. Without this proper registration, even if the key blade is cut correctly, the car will not start. The remote functions (lock, unlock, panic) are also programmed separately but rely on the same specialized tools.

Expect to pay for both the parts (key fob and integrated key blade) and the labor for programming and cutting. The cost will generally range from $150 to $400, depending on your chosen service provider (locksmith versus dealer) and whether you provide the key fob yourself or purchase it through them.

Find a mobile locksmith or shop on Repairius.