Subaru Key Fob Battery Replacement: Complete Step-by-Step Guide

Subaru Key Fob Battery Replacement: Losing access to your vehicle because of a dead key fob battery can be frustrating. Fortunately, replacing the battery in a Subaru key fob is quick, inexpensive, and can be done at home in just a few minutes. Whether you drive an Outback, Forester, Crosstrek, or Impreza, the process is almost identical.

This guide explains which battery type your Subaru key fob uses, how to open the key fob safely, replace the battery, and reprogram if needed — everything you need to keep your remote working perfectly.

1. Understanding the Subaru Key Fob

Every modern Subaru uses a keyless entry system powered by a small coin-cell lithium battery inside the fob. This battery powers the transmitter that locks, unlocks, and starts your car.

There are two main types of Subaru key fobs:

• Standard Remote Key Fob – Found in older models (pre-2018). Has lock/unlock/trunk buttons and a physical key blade.
• Smart Key (Push-Start) – Used in most newer Subaru models. Features proximity sensing, allowing the car to unlock automatically when you approach.

Battery Type by Model

Most Subaru key fobs use a CR2032 lithium coin cell, which can be purchased at auto parts stores, supermarkets, or online for less than $5.

2. Signs Your Subaru Key Fob Battery Is Dying

Recognizing when your Subaru key fob battery is running low helps you avoid being locked out or unable to start the car.

Common Warning Signs:

• Reduced range – You need to stand closer to the car for it to respond.
• Delayed response – The doors take longer to unlock or lock.
• Dashboard warning – Some Subaru models display a message such as “Key Fob Battery Low.”
• Push-start issues – The engine doesn’t recognize the key immediately.

If you experience any of these symptoms, it’s time to replace the battery before the fob fails completely.

3. Tools You’ll Need for Subaru Key Fob Battery Replacement

You don’t need any special equipment — just a few simple tools and a new battery.

Tools and Supplies:

• CR2032 (or CR1620) lithium coin battery
• Small flathead screwdriver or plastic pry tool
• Soft cloth or towel (to protect the key fob surface)

Safety Tip:

Avoid using metal tools directly on the circuit board. If possible, use a plastic pry tool to prevent scratches or internal damage.

4. Step-by-Step: How to Replace the Subaru Key Fob Battery

Replacing the Subaru key fob battery is easy and takes less than five minutes. Follow these detailed steps:

Step 1: Remove the Mechanical Key

• On the back of your Subaru key fob, locate the small release button.
• Press it to pull out the mechanical key hidden inside the fob.

Step 2: Open the Key Fob

• Insert a small flat screwdriver or the key itself into the seam or notch where the two halves meet.
• Gently twist or pry to open the fob — be careful not to crack the plastic casing.

Step 3: Locate and Remove the Old Battery

• Once opened, you’ll see a round lithium battery seated in its slot.
• Note the battery orientation (+ side facing up) before removing it.
• Carefully lift out the old battery using your fingers or a plastic tool.

Step 4: Insert the New Battery

• Place the new CR2032 battery in the slot with the positive (+) side facing up.
• Make sure it sits flat and snug within the holder.

Step 5: Reassemble the Key Fob

• Snap the two halves of the key fob back together until you hear a click.
• Reinsert the mechanical key.

Step 6: Test the Key Fob

• Stand near your Subaru and test lock/unlock/start functions.
• If the fob doesn’t respond, remove the battery and reinsert it firmly to ensure contact.

Your Subaru key fob should now work perfectly again.

5. Tips for Extending Key Fob Battery Life

You can extend the life of your Subaru key fob battery with a few simple habits:

• Avoid leaving the fob in hot or cold environments, such as inside the car on hot days.
• Don’t press buttons unnecessarily, especially when storing the fob in your pocket or bag.
• Keep it away from electronics (phones, laptops) that emit radio signals — they can drain the battery faster.
• Replace the battery every 2–3 years as part of routine maintenance, even if it hasn’t failed yet.

Also, if your car isn’t detecting the key fob after battery replacement, try resetting or re-synchronizing it by locking/unlocking the car manually with the physical key once.

6. When to Visit a Subaru Dealer

In most cases, Subaru key fob battery replacement can be done easily at home. However, visit your Subaru dealership or authorized service center if:

• The key fob stops working even after a new battery is installed.
• The internal components were accidentally damaged during replacement.
• You need help with reprogramming or pairing a new fob to the car’s system.

Dealers can test your key fob’s signal strength, reprogram it to your vehicle, or provide a replacement key fob if necessary.

Remember: maintaining a spare battery and a backup key ensures you’re never stranded with a non-functional remote.

Conclusion

Replacing the Subaru key fob battery is a simple, do-it-yourself task that saves time and money. With just a CR2032 coin cell and a few basic tools, you can restore full functionality to your Subaru’s remote system in minutes.

Whether you drive an Outback, Forester, Crosstrek, or Ascent, this easy process keeps your keyless entry working smoothly and ensures you’re never locked out unexpectedly.

FAQs

1. What battery does my Subaru key fob use?
Most models use a CR2032 lithium coin battery, though some older Impreza trims use CR1620.

2. How long does a Subaru key fob battery last?
Typically 2 to 3 years, depending on use frequency and temperature exposure.

3. Can I use any CR2032 battery?
Yes — but choose trusted brands like Panasonic, Energizer, or Duracell for long life.

4. Do I need to reprogram my key fob after battery replacement?
Usually no. The key fob automatically reconnects once powered.

5. What if my key fob still doesn’t work?
Check the battery orientation and contacts. If the issue persists, contact your Subaru service center.

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