How to Open a Subaru Key Fob and Replace the Battery

A dead Subaru key fob can leave you stuck outside your car, but replacing the battery is a quick fix you can handle yourself. This guide shows you exactly how to open a Subaru key fob, remove the old battery, and install a new one in just a few minutes. You will learn which tools you need, the correct battery type, and common mistakes to avoid.

A dead Subaru key fob can leave you standing in your driveway, unable to unlock the doors or start the engine. It is a frustrating moment, but the fix is almost always simple. In most cases, all you need to do is open the fob and swap out the old battery for a new one.

Whether you drive a Subaru Outback, Forester, Legacy, or another model, the process for opening the remote and replacing the battery is very similar across most years and trims. This guide walks you through every step in plain language, so you do not need to visit a dealer or pay for a service call.

By the time you finish reading, you will know exactly how to open a Subaru key fob, which battery to use, how to test the remote afterward, and when it is time to consider a full key fob replacement. Let us get started.

Key Takeaways

• Opening a Subaru key fob is simple: You only need a small flathead screwdriver or a coin to pop open the cover.
• Use the right battery: Most Subaru key fobs use a CR2032 button battery, which is easy to find at any store.
• Check the battery orientation: Making sure the positive and negative sides face the correct direction prevents common issues.
• No reprogramming is needed: After swapping the battery, your Subaru key fob should work right away without extra steps.
• Know when to replace the whole fob: If the buttons are worn out or the fob is physically damaged, a full replacement may be the better choice.
• Keep spare batteries on hand: Storing a CR2032 battery in your glove box saves you from getting stranded.

Understanding Your Subaru Key Fob

Before you pop open the cover, it helps to know what you are looking at. A Subaru key fob is a small remote device that sends a radio signal to your car. When you press a button, the fob tells the car to lock, unlock, or start the engine.

Most Subaru remotes have a few common parts. The outer shell is made of hard plastic and splits into two halves. Inside, you will find the circuit board, the buttons, the key fob battery, and sometimes a small metal emergency key blade. Understanding these pieces makes the whole process much less intimidating.

What Type of Battery Does a Subaru Key Fob Use?

The vast majority of Subaru key fobs run on a CR2032 battery. This is a standard 3-volt button cell battery that you can find at almost any grocery store, pharmacy, or auto parts shop. The CR2032 is one of the most common button batteries in the world, so you should never have trouble finding a replacement.

Some older Subaru models may use slightly different battery sizes, but the CR2032 is the go-to choice for most modern remotes. Before you buy a new battery, check your owner’s manual or look at the old battery to confirm the model number printed on it.

How Long Does a Subaru Key Fob Battery Last?

A dead key fob battery typically lasts between two and four years, depending on how often you use the remote. If you press the buttons multiple times a day, the battery will drain faster. Cold weather can also shorten the key fob battery life, so drivers in northern climates may need to replace the battery more often.

If you notice that your Subaru remote key needs to be closer to the car to work, or if the range feels shorter than usual, these are early signs that the battery is dying. Replacing it early can save you from a fully dead fob at the worst possible moment.

Tools You Need to Open a Subaru Key Fob

The good news is that you do not need any fancy tools or technical skills to open a Subaru key fob. Most people already have everything they need sitting in a kitchen drawer or toolbox.

Here is a simple list of what you will need:

• A small flathead screwdriver or a thin, sturdy plastic pry tool
• A CR2032 replacement battery (make sure it is a fresh one)
• A clean, soft cloth to wipe down the inside of the fob
• A well-lit workspace where you can see the small internal parts clearly

Some people like to use a coin instead of a screwdriver. A quarter or a dime can work in a pinch, but a flathead screwdriver gives you more control and reduces the risk of scratching the plastic shell. If your Subaru key fob model came with a small plastic opening tool, that works perfectly too.

Also, keep a few things in mind before you start working. Make sure your hands are clean and dry. Oils and moisture from your fingers can damage the circuit board over time. If you have a lot of small screws or parts, consider using a magnetic tray to keep them from rolling away.

If you are someone who likes to keep your workspace tidy, you might also enjoy reading our article on how to organize a study desk for tips on keeping small items like batteries and tools neatly arranged.

Step-by-Step: How to Open a Subaru Key Fob

Now for the part you have been waiting for. Opening a Subaru key fob is straightforward, but you do need to be gentle. The plastic clips that hold the two halves together are fragile, and forcing them can cause cracks or breaks.

Step 1: Locate the Seam

Hold the fob in your hand and look closely at the edges. You will see a thin line or seam where the two halves of the shell meet. This is where the fob splits open. On most Subaru remotes, the seam runs along the longer side of the fob.

Some models have a small arrow or notch near the seam that indicates which direction to pry. If you see one, follow it. If not, do not worry, we will walk through the next steps together.

Step 2: Insert the Screwdriver

Slide the tip of your flathead screwdriver into the seam at one end of the fob. Go slowly and gently. You should feel the plastic clips give way with light pressure. Do not force the screwdriver in. If it does not slide in easily, try a different spot along the seam.

Once the screwdriver is in about a quarter of an inch, twist it slightly to pop the first clip loose. You will hear or feel a small click when the clip releases.

Step 3: Work Around the Fob

After popping the first clip, move to the next section of the seam and repeat the process. Work your way around the entire edge of the fob, releasing one clip at a time. Most Subaru fobs have three or four clips holding the two halves together.

Take your time with this step. Rushing can crack the shell or damage the circuit board inside. Once all the clips are released, the two halves should separate easily.

Step 4: Remove the Old Battery

Now you will see the inside of your Subaru key fob. The battery sits in a small compartment on the circuit board. It is usually held in place by a tiny metal clip or simply sits in a slot.

Use the tip of your screwdriver or your fingernail to gently lift the clip or pry the battery out. Pay close attention to which side of the battery faces up. The positive side (usually marked with a plus sign and sometimes the number 2032) should face upward in most Subaru fobs.

Set the old battery aside. You can recycle it at most electronics stores or battery recycling centers. Do not throw it in the regular trash, as button batteries can be harmful to the environment.

For those who keep their keys and small electronics on their desk at home, you might find our piece on what to put on a study desk helpful for organizing your workspace alongside your keys and remotes.

Step 5: Insert the New Battery

Take your fresh CR2032 battery out of the packaging. Check it for any damage or dust before installing it. Hold the battery with the positive side facing up and drop it into the compartment, or slide it under the metal clip if your fob uses one.

Make sure the battery sits flat and snug in its slot. A loose battery can cause intermittent problems with your Subaru key fob. Press down gently on the battery to confirm it is secure.

Step 6: Reassemble the Fob

Align the two halves of the fob shell carefully. Make sure no wires or small parts get pinched between the halves. Press the two sides together firmly until you hear all the clips click back into place.

Give the fob a gentle squeeze to make sure the shell is fully seated. If any part feels loose or the seam is uneven, open it back up and check that all clips are properly engaged.

If you are looking for ideas on how to arrange your workspace at home so that items like your key fob are always easy to find, you might enjoy our guide on where should a study desk be placed for helpful layout tips.

How to Replace the Battery in Your Subaru Key Fob

Replacing the battery is the core of this process, and we have already covered the steps above. But let us go a little deeper into what makes a battery replacement successful and what you should watch out for.

The most common mistake people make is putting the battery in backwards. If the fob does not work after you reassemble it, open it back up and check the orientation of the battery. The positive side must face the direction that makes contact with the car’s signal receiver.

Another thing to watch for is corrosion. If you see any greenish or white buildup on the battery contacts, wipe it away carefully with a clean cloth or a cotton swab dipped in a small amount of white vinegar. Corrosion can prevent your Subaru key fob from making proper electrical contact, even with a brand-new battery.

Also, make sure you are using a fresh battery. Batteries that have been sitting on a shelf for a year or two may already be partially drained. Always check the expiration date on the battery packaging before you install it.

If you want to extend the life of your key fob battery, try these simple habits:

• Avoid dropping the fob on hard surfaces
• Keep the fob away from extreme heat and moisture
• Do not press the buttons unnecessarily when you are far from the car
• Store the fob in a dedicated spot so it does not get lost or damaged

Troubleshooting: What to Do If the Key Fob Still Does Not Work

You have opened the Subaru key fob, replaced the battery, and reassembled everything, but the remote still does not work. Do not panic. There are a few common reasons this can happen, and most are easy to fix.

Check the Battery Orientation Again

This is the number one cause of problems after a battery swap. Open the fob back up and double-check that the positive and negative sides of the battery are facing the correct direction. Even a small mistake here will prevent the fob from sending a signal.

Clean the Battery Contacts

Over time, the metal contacts inside the fob can accumulate dirt or oxidation. Use a dry cloth or a pencil eraser to gently clean the contact points. This simple step often restores full function to a key fob not working after a battery change.

Check for Water Damage

If your Subaru remote key has been exposed to rain, sweat, or any moisture, water damage could be the culprit. Look for any signs of corrosion or discoloration on the circuit board. If the fob has been soaked, it may need professional repair or a full Subaru key replacement.

Try the Emergency Key

Most Subaru key fobs include a hidden emergency key blade. You can use this to manually unlock the driver’s door if the remote is completely unresponsive. Once inside, you can start the car using the push button start or the ignition slot, depending on your model.

When the Buttons Are Worn Out

If the battery is new and the contacts are clean, but the fob still does not work, the buttons themselves may be worn out. Heavy daily use can cause the rubber contacts on the circuit board to degrade. In this case, a full key fob replacement is the best solution.

When to Replace the Entire Subaru Key Fob

Replacing the battery solves most problems, but there are times when a full key fob replacement is the better choice. Here are some signs that it is time to invest in a new fob:

• The plastic shell is cracked or broken and cannot be reassembled properly
• The buttons are visibly worn, sticky, or unresponsive even after cleaning
• The fob has been exposed to water and shows signs of internal corrosion
• The remote range has become very short even with a new battery
• The fob is more than five years old and has never had the battery replaced

A new Subaru key fob can cost anywhere from $50 to $200 depending on the model and where you buy it. Some dealers offer programming services if your new fob needs to be paired with your car. However, many aftermarket fobs come pre-programmed or are simple enough to sync yourself using your owner’s manual.

If you are handy with small repairs and enjoy doing things yourself, opening a Subaru key fob and replacing the battery is a great way to save money and avoid a trip to the dealer. Even if you eventually need a full replacement, knowing how the fob works inside gives you a big advantage.

Final Thoughts

Opening a Subaru key fob and replacing the battery is one of the easiest DIY repairs you can do. It takes just a few minutes, costs only a couple of dollars for a new battery, and requires no special skills or tools. With a flathead screwdriver and a fresh CR2032 battery, you can have your remote working like new again.

The key is to go slowly, pay attention to the battery orientation, and handle the plastic shell gently. If you follow the steps in this guide, you will avoid the most common mistakes and walk away with a working Subaru key fob in hand.

Keep a spare CR2032 battery in your glove box or junk drawer so you are always prepared. And remember, if the fob is physically damaged or the buttons are completely worn out, do not hesitate to replace the entire unit. A new Subaru key fob is a small investment that pays off in convenience and peace of mind.

Now that you know how to handle this simple repair, you can tackle it the next time your dead key fob battery leaves you standing outside your car. You have got this.

Frequently Asked Questions

What type of battery does a Subaru key fob use?

Most Subaru key fobs use a CR2032 3-volt button cell battery. This is a widely available battery that you can find at grocery stores, pharmacies, and auto parts shops. Always check the label on the old battery before purchasing a replacement to confirm the model number.

How long does a Subaru key fob battery last?

A Subaru key fob battery typically lasts between two and four years, depending on usage frequency. Cold weather and heavy daily use can shorten the lifespan. If you notice reduced range or weak signal strength, it is usually time to replace the battery.

Do I need to reprogram my Subaru key fob after changing the battery?

No, you do not need to reprogram your Subaru key fob after a simple battery swap. The fob retains its programming as long as the circuit board is not damaged. Your remote should work immediately after you reassemble the fob and install the new battery.

What should I do if my Subaru key fob still does not work after replacing the battery?

First, double-check that the battery is installed with the correct orientation. Next, clean the battery contacts with a dry cloth or a pencil eraser. If the fob still does not work, check for water damage or worn-out buttons. In some cases, a full key fob replacement may be necessary.

Can I open a Subaru key fob without a screwdriver?

Yes, you can use a coin, a plastic pry tool, or even your fingernail in some cases. A small flathead screwdriver gives you the most control and reduces the risk of damaging the plastic shell. Whatever tool you use, go slowly and apply gentle pressure to avoid cracking the fob.

How much does it cost to replace a Subaru key fob battery?

A CR2032 battery costs between $3 and $10 at most retail stores. The entire battery replacement process takes less than five minutes and requires no special skills. This makes it one of the cheapest and easiest car maintenance tasks you can do at home.

=== CONCLUSION ===

Replacing the battery in your Subaru key fob is a quick, easy, and affordable task that anyone can do at home. You now know how to open the fob safely, which battery to use, and how to troubleshoot common issues if the remote does not work right away.

Keep spare CR2032 batteries on hand, handle your fob with care, and you will avoid the frustration of a dead key fob battery at the worst possible time. Share this guide with a friend or family member who might benefit from learning how to open a Subaru key fob and replace the battery themselves.