2021 Ford Explorer Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

Unfortunately, the 2021 Ford Explorer does not support DIY on-board programming for its smart key fob. The sophisticated security systems in modern Ford vehicles, including the 2021 Explorer, require specialized diagnostic equipment to program new key fobs. This procedure involves accessing the vehicle's immobilizer system through the OBD-II port, which can only be done with a professional-grade scan tool.

Attempting to program a new key fob without the correct equipment can potentially damage the vehicle's immobilizer system or render the new key fob unusable. Therefore, this task must be performed by a Ford dealership or a certified automotive locksmith.

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 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 the two halves of the key fob apart. Be careful not to use excessive force to avoid damaging the casing.
4. Once separated, you will see the CR2450 coin cell battery. Note its orientation (which side is positive facing up).
5. Carefully remove the old battery, using a non-metallic tool if possible to avoid scratching the contacts.
6. Insert the new CR2450 battery with the positive (+) side facing the same direction as the old battery.
7. Align the two halves of the key fob and press them together until they snap securely into place.
8. Reinsert the emergency key blade.
9. Test the key fob functions to ensure it is working correctly.

Where to buy a replacement fob

Choosing where to purchase a replacement key fob can significantly impact cost and convenience. Here's a breakdown of your options:

• Ford Dealership:

  • Pros: Guaranteed genuine OEM part, often comes with programming included, and staff are highly familiar with Ford systems.
  • Cons: Most expensive option. Expect to pay anywhere from $300 to $500+ for the key fob and programming.

• Automotive Locksmith:

  • Pros: Often more affordable than a dealership. Locksmiths have access to the necessary programming equipment and can often come to your location (mobile service). They can also cut the emergency key blade on-site. Prices typically range from $200 to $400, including the fob and programming.
  • Cons: Ensure the locksmith is reputable and experienced with modern Ford key programming.

• Online Retailers (Amazon, eBay, etc.):

  • Pros: Potentially the cheapest option for the key fob itself. You might find compatible smart key fobs (e.g., those listed as 164-R8166 compatible) for $50 to $150.
  • Cons: The key fob will still need to be programmed by a locksmith or dealership, adding to the overall cost. You also run the risk of purchasing a counterfeit or incompatible fob, which could lead to wasted money and frustration. Additionally, the emergency key blade will need to be cut separately.

If on-board programming isn't supported

Since the 2021 Ford Explorer requires a diagnostic scan tool for key fob programming, you'll need to factor in the cost of professional service. The key fob contains an immobilizer transponder chip, which is crucial for starting the vehicle. This chip must be correctly programmed to the vehicle's immobilizer system; otherwise, the car will not start, even if the remote functions work.

Expect the total cost (fob + programming + key cutting) to be in the range of $200 to $500, depending on whether you choose a locksmith or a dealership, and if you provide your own fob or purchase it through them. While it might seem like a significant expense, it's a necessary one for the security and functionality of your vehicle.

Find a mobile locksmith or shop on Repairius.