Opening your Subaru key fob is straightforward once you know where to look for the seam

Most Subaru key fobs open by locating a small slot or seam on the edge of the fob and gently prying it apart with a flat tool. The exact method depends on your model year and fob design, but the process takes less than a minute and requires no special equipment. You'll find the seam either on the side of the fob or between the front and back halves.

The most common reason to open your fob is to replace the battery, which typically lasts three to four years depending on how often you use the remote. When your fob stops responding or only works from very close range, a dead battery is usually the culprit. Opening it yourself costs just a few dollars for a replacement battery instead of $50 to $150 at a dealership.

Key Takeaways

  • Subaru key fobs typically open by inserting a flat tool into a seam on the side or edge and gently twisting to separate the two halves.
  • The battery type varies by model year — check your owner's manual or the old battery itself to see whether you need a CR2032, CR2025, or another size.
  • Replacement batteries cost $3 to $8 at drugstores, grocery stores, or online retailers, compared to $50 to $150 if you have a dealership replace it.
  • After inserting the new battery, snap the fob halves back together and test all buttons before putting it away.

Finding the seam on your specific Subaru model

The location of the opening seam varies slightly between Subaru generations. On most models from 2010 onward, you'll see a thin line running vertically down one side of the fob — this is where the two plastic halves meet. On some older models, the seam runs horizontally between the top and bottom sections.

Look closely at the edges of your fob under good lighting. You may see a tiny notch or indentation that marks the starting point for prying. If you're unsure, your owner's manual usually includes a diagram showing where to insert a tool. You can also search online for "[your model year] Subaru key fob opening" to find photos or videos of the exact fob you have.

Tools and materials you'll need

You need only a flat, thin tool to open the fob — a coin, a flathead screwdriver, a butter knife, or even a plastic spoon works. Avoid anything too sharp or thick, which can crack the plastic housing. A plastic pry tool designed for phone or electronics repair is ideal if you have one, but it's not necessary.

Once the fob is open, you'll need a replacement battery. Before you buy one, check what size your current battery is — it's printed on the battery itself. Most Subaru fobs use a CR2032 (the most common), but some use CR2025 or CR2016. You can find these at any pharmacy, grocery store, or online. They cost between $3 and $8 for a single battery, or $10 to $15 for a multi-pack.

Step-by-step process for opening the fob

Step 1: Locate the seam. Hold the fob in good light and identify the thin line where the two halves meet. This is usually on the side or between top and bottom sections.

Step 2: Insert your tool gently. Place the edge of your flat tool into the seam. Do not force it — if it doesn't slide in easily, you may be in the wrong spot. Rotate the fob and try a different section of the seam.

Step 3: Twist gently to separate the halves. Once the tool is seated in the seam, explore gentle twisting pressure. The two halves should begin to separate. You may hear a small click as the internal clips release. Stop as soon as you feel resistance — do not pry hard or you risk cracking the plastic.

Step 4: Lift the halves apart. Once the seam has opened slightly, you can usually pull the two halves apart by hand. Set them on a clean surface with the battery side facing up so you can see the battery clearly.

Removing and replacing the battery

The battery sits in a small metal or plastic holder inside the fob. Note which side is facing up — the positive side (marked with a + symbol) should face toward you. Gently pry the old battery out using your fingernail or a plastic tool. Do not use a metal tool directly on the battery, as this can damage the contacts.

Before inserting the new battery, check that the metal contacts inside the fob are clean and free of corrosion. If they look dark or crusty, wipe them gently with a dry cloth or a cotton swab. Insert the new battery with the positive side facing the same direction as the old one was facing. Press down gently until it sits flat in the holder.

Reassembling the fob and testing it

Align the two halves of the fob so the seam lines up evenly. Press them together firmly until you hear or feel a click — the internal clips should snap back into place. The fob should feel solid and not have any gaps between the halves.

Test each button on the fob while standing near your Subaru. Press the lock button, unlock button, and panic button (if your model has one) and listen for the car to respond. If the fob doesn't work, open it again and check that the battery is inserted correctly with the positive side facing the right direction. If it still doesn't work after a second attempt, the battery may be defective — try a fresh one from a different package.

When to replace the battery versus the whole fob

A new battery solves the problem in the vast majority of cases. However, if your fob has been dropped, exposed to water, or the buttons are physically broken, a battery replacement won't help. In those cases, you'll need a replacement fob from a Subaru dealership or a third-party electronics retailer.

If you've replaced the battery and the fob still doesn't work, the internal circuit board may be damaged. This is rare but can happen if the fob has been exposed to moisture or extreme heat. A dealership can test the fob's electronics and tell you whether repair or replacement is the better option.

Frequently Asked Questions

What if I can't get the fob open without breaking it?

Stop and try a different section of the seam — you may be prying in the wrong spot. If you've tried multiple locations and the fob still won't budge, a Subaru dealership can open it for you, usually at no charge if you're having them replace the battery anyway. Forcing it risks cracking the plastic housing permanently.

Can I use any battery, or does it have to be a specific brand?

Any CR2032, CR2025, or CR2016 battery (depending on your fob model) will work — the brand doesn't matter. Duracell, Energizer, Amazon Basics, and store brands all perform the same. Buy whichever is cheapest or most convenient to find.

How long does a new battery last?

Most key fob batteries last three to four years with normal use. If you use your fob frequently — multiple times per day — it may last two to three years. If you rarely use it, it could last five years or longer. When the range starts to shrink, it's time to replace it again.

Is it safe to open the fob myself, or should I go to a dealership?

Opening the fob yourself is safe and straightforward. You're not working with electricity or anything that can harm you. The only risk is cracking the plastic if you pry too hard, which is why gentle, steady pressure is important. Millions of people open their key fobs at home every year without any problems.

What should I do if I lose a screw or clip when opening the fob?

Most Subaru key fobs don't have screws — they snap together with internal clips. If you do lose a clip, the fob may feel loose but will still function. If it bothers you, a dealership can replace the housing, or you can order a replacement fob case online for $10 to $20 and transfer your battery and circuit board into it.