A weak key fob battery can be annoying. You may have to stand closer to your car, press the buttons many times, or the doors may not unlock at all.
To change a Subaru key fob battery, use the key to twist open the fob, lift the small silver tab, remove the old battery, and replace it with a CR1620 or CR2032 battery, depending on your fob type.
This guide explains everything in simple steps. You will learn which battery your key fob needs, how to open the fob safely, and what to do if it still doesn’t work after changing the battery.
What Battery Does a Subaru Key Fob Use?
Subaru uses different styles of key fobs, and each one uses a specific type of battery. Before you open the fob, it helps to know which battery you need.
1. Push-button start key fob – CR2032
Most newer Subarus come with a keyless push-start system. These fobs are made in a rectangular shape. They usually take a CR2032 coin-cell battery.
2. Teardrop-style older key fob – CR2025
Some older Subaru models use a small, rounded, teardrop-shaped key fob. These often use a CR2025 battery.
3. Traditional key with buttons – CR1620
Older Subarus with a metal key and buttons built into the key head usually take a CR1620 battery.
How to Identify Your Key Fob
If you’re unsure, look at the shape:
- Rectangular = CR2032
- Teardrop = CR2025
- Key with built-in buttons = CR1620
You can also check your car manual or search for your Subaru model and year.
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Tools You Need Before Starting
You will only need a few simple items:
- The correct replacement battery (CR2032, CR2025, or CR1620)
- A small flat-head screwdriver or even a coin
- A clean, flat surface to work on
- Optional: Tweezers to handle the battery
It’s always a good idea to keep the new battery in the original package until you use it. This prevents dirt or static from touching the battery contacts.
Step-by-Step Guide to Changing the Subaru Key Fob Battery
Follow these simple steps to replace the battery safely.
Step 1: Remove the Mechanical Key
Most modern Subaru fobs have a small metal key hidden inside. Look for a small release button on the back of the fob. Slide or press it, then pull out the metal key.
Removing the key helps you access the seam where the fob opens.
Step 2: Open the Key Fob Case
Find the little gap or seam between the two halves of the plastic case. Insert your flat-head screwdriver or coin into the gap. Turn it gently to pop the two sides apart.
Tips to avoid damage:
- Don’t force the tool too hard.
- Work slowly around the edges.
- If it doesn’t open easily, try a different spot along the seam.
The fob should come apart with a light pop.
Step 3: Remove the Old Battery
Once the fob is open, you will see the small circular battery. Take note of how the battery is sitting inside. Usually, the positive + side faces up, but it may vary.
Use your fingertip or a small tool to lift the battery out. If the inside looks dirty or dusty, gently wipe it with a dry cloth.
Do not use water or cleaners because they may damage the electronics.
Step 4: Insert the New Battery
Take your new battery and place it in the same position the old one was in. Make sure the positive side faces the same direction as before.
Push it down gently until it sits firmly in place.If the battery does not sit flat, check for small clips or contacts that might be blocking it.
Step 5: Close the Key Fob
Line up the two halves of the key fob and press them together. You should hear a small click when they snap back into place.
If your fob has screws (most don’t), tighten them gently. Then slide the mechanical key back into its slot.
Step 6: Test the Key Fob
Try pressing the lock and unlock buttons. Stand a short distance from your car and see if it responds.
Check any other buttons you have:
- Panic
- Trunk
- Remote start (if your car supports it)
If the buttons work normally, the battery change was successful.
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Subaru Models and Their Battery Types (Quick Reference Table)
Here is a simple table to help identify the battery type based on common Subaru models.
| Subaru Model | Key Fob Type | Battery Type |
| Outback | Push-start | CR2032 |
| Forester | Push-start | CR2032 |
| Crosstrek | Push-start | CR2032 |
| Impreza | Various types | CR2032 / CR2025 / CR1620 |
| WRX | Mixed styles (depends on year) | CR2032 or CR2025 |
| Ascent | Push-start | CR2032 |
Always double-check your exact model year because Subaru sometimes changes the type.
What to Do If the Key Fob Still Doesn’t Work
Sometimes the key fob may still not work even after you replace the battery. Here are the most common causes and easy fixes:
1. Wrong Battery Orientation
This is the most common mistake. Make sure the + side is facing the correct way.
2. Battery Not Seated Correctly
If the battery is loose or tilted, the contacts won’t touch.
3. Dirty Contacts
If dirt or dust is blocking the metal contacts, the fob may not work. Use a dry cloth to gently clean the inside.
4. Battery Is Defective
Even new batteries can be faulty. Try another one from a known brand.
5. Key Fob Needs Reprogramming
In rare cases, the fob may lose its programming.
This usually happens if the battery was left out for too long. In this case, a dealer or locksmith can reprogram it.
6. The Key Fob Itself Is Damaged
If the fob was dropped or exposed to water, the internal circuit may be damaged. You might need a replacement fob.
How Long a Subaru Key Fob Battery Lasts
Most key fob batteries last 1 to 2 years.
However, the lifespan depends on things like:
- How often you use the fob
- How far you stand when unlocking your car
- Weather and temperature
- Age of the key fob
If you notice the range getting shorter, the battery is getting weak.
Where to Buy Subaru Key Fob Batteries
These coin-cell batteries are easy to find. You can buy them at:
- Hardware stores
- Auto parts stores
- General retail stores
- Online shops
Make sure you buy from a known brand to avoid low-quality batteries.
Tips to Extend Key Fob Battery Life
You can make the new battery last longer by following a few simple habits.
1. Avoid Extreme Temperatures
Heat and cold can drain batteries faster.
Don’t leave the fob in a hot car or out in freezing temperatures when possible.
2. Keep It Away from Other Electronics
Phones, tablets, and other devices may interfere with the fob’s signal.
3. Don’t Sit or Sleep on It
If the buttons keep getting pressed in your pocket or bag, the battery will drain quickly.
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4. Store Spare Batteries Properly
Keep spare batteries in a cool, dry place in their original packaging.
How To Change Battery In Subaru Key Fob 2021
To change the battery in a 2021 Subaru key fob, open the fob with a small flat tool, remove the old CR2032 battery, and insert a new one with the positive side facing up. Close the fob and test the buttons.
How To Change Battery In Subaru Key Fob 2016
A 2016 Subaru key fob usually uses a CR2025 battery. Open the fob by gently prying the seam, take out the old battery, and place the new one in the same position. Snap the fob shut and check its functions.
How To Change Battery In Subaru Key Fob 2022
Most 2022 Subaru models use a CR2032 battery. Open the key fob case with a small tool, remove the old battery, and insert the new one with the positive side up. Close the fob firmly and test the lock and unlock buttons.
Subaru Key Fob Battery Type
Subaru key fobs use three main battery types: CR2032 for most new models, CR2025 for older teardrop fobs, and CR1620 for older key-with-button designs. Always check your key fob shape or car manual to confirm the correct battery.
Subaru Outback Key Fob Battery Replacement
Most Subaru Outback models use a CR2032 battery. Open the fob by prying the seam, remove the old battery, and insert a new one with the positive side facing up. Close the fob securely and test the buttons to ensure everything works.
Subaru Forester Key Fob Battery Replacement
The Subaru Forester usually uses a CR2032 battery. Open the key fob, lift out the old battery, and place the new one in the same position. Close the fob tightly and check the lock, unlock, and panic buttons to confirm proper working.
Subaru Key Fob Battery Replacement Cost
Replacing a Subaru key fob battery is inexpensive. A CR2032 or CR2025 battery usually costs only a few dollars. If you replace it yourself, that’s all you pay. A dealer or shop may charge a small fee for doing it.
Subaru Forester Key Fob Battery Type
Most Subaru Forester models use a CR2032 battery. It’s a common coin-cell battery found in many key fobs. You can check your fob shape or owner’s manual to confirm the type before buying a replacement.
FAQs
How do I change my battery in my Subaru key fob?
Open the fob, remove the old battery, insert a new one in the same direction, then close and test it.
Can I replace the key fob battery myself?
Yes, you can replace it yourself. It only takes a small tool, a new battery, and a few simple steps.
What size battery do Subaru key fobs take?
Subaru key fobs use CR2032, CR2025, or CR1620 batteries, depending on the fob style and car model year.
How to open a Subaru key fob 2013?
Find the small seam, insert a flat tool, and gently twist to open the fob without damaging the plastic.
How to remove battery cover for Subaru key fob?
Use a flat tool to lift the small notch on the fob, then gently separate the cover to reach the battery.
Do I need to reset my car key fob after replacing the battery?
No, most Subaru key fobs work instantly after battery replacement. Resetting is rarely needed unless the fob is damaged.
Can I change my Subaru battery myself?
Yes, you can change it easily. Just open the fob, swap the battery, close it, and test the buttons afterward.
What happens if my Subaru key battery dies?
The fob may stop unlocking the car, but most models still start when you hold the fob near the start button.
Conclusion
Changing the battery in a Subaru key fob is a quick and easy job that anyone can do at home. With just a small tool and the right battery, you can open the fob, replace the old battery, and get it working like new again.
If the fob still doesn’t respond, double-check the battery direction, clean the contacts, or try another battery. Only in rare cases will you need help from a dealer or locksmith.
By keeping a fresh battery in your key fob, you avoid lock or start problems and make your daily driving smoother and stress-free.