How to Change the Battery in a Subaru Key Fob
Subaru key fobs are small, sealed units that run on a single coin-cell battery. When the battery starts to die, you'll usually notice the remote's range shrinking — buttons that used to work from across a parking lot suddenly require you to be standing next to the car. Eventually, the fob stops responding entirely. Replacing the battery is a straightforward job most owners can do in under five minutes with no tools.
What Battery Does a Subaru Key Fob Use?
Most Subaru key fobs use a CR2032 lithium coin-cell battery — a flat, round, 3-volt battery widely available at grocery stores, pharmacies, hardware stores, and online. Some older or less common Subaru fob designs use a CR1620 or CR2025 instead. Before buying a replacement, check your owner's manual or inspect the old battery once you open the fob — the battery type is printed directly on its face.
Battery cost is minimal. A CR2032 typically runs $2–$5 for a single battery at retail, less if purchased in a multi-pack.
How to Identify Your Subaru Key Fob Type
Subaru has used several different fob designs across its model lineup and model years. The basic procedure is similar across all of them, but the way you open the housing varies slightly.
Common Subaru key fob styles:
- Flip key (integrated key blade): The mechanical key folds into the fob body. These typically have a seam along the side that you pry open.
- Proximity/push-button start fob: Larger, rounder units used on models with keyless entry and push-button start. These often have a hidden mechanical key inside and a release button or slot.
- Traditional key fob (separate key ring): A smaller remote that attaches to a separate key. These usually split apart along a center seam.
Your owner's manual will specify which style came with your vehicle and may include step-by-step instructions.
Step-by-Step: Changing a Subaru Key Fob Battery 🔋
The general process follows the same logic across most Subaru fobs:
1. Remove the mechanical key (if applicable) On flip keys and proximity fobs with hidden blades, locate the small release button or slider — usually on the back or side — and slide it to pop out the metal key. Set it aside.
2. Find the seam Look for a small notch, slot, or indent along the edge of the fob body. This is the pry point.
3. Open the housing Insert a small flathead screwdriver or a coin into the notch and gently twist to separate the two halves. Some fobs split cleanly; others may have a small locking tab you need to release first. Work slowly to avoid cracking the plastic.
4. Remove the old battery The coin-cell battery sits in a circular tray or clip inside the fob. Use a fingernail or the edge of a flathead screwdriver to pop it out. Note which side faces up — typically the positive (+) side faces up (toward the circuit board), but confirm before installing the new one.
5. Insert the new battery Place the new battery in the same orientation as the old one. Press it gently until it seats flat in the tray.
6. Reassemble the fob Snap the two halves back together firmly until you hear or feel a click. Reinsert the mechanical key if you removed one.
7. Test the fob Stand near your vehicle and press the lock or unlock button. If it works, you're done. If it doesn't, double-check the battery orientation and that the housing is fully closed.
Variables That Can Affect the Process
The job is simple, but a few factors can change what you're working with:
| Variable | How It Affects the Job |
|---|---|
| Model year | Older Subarus (pre-2010s) often use simpler fob designs; newer models may have more complex housings |
| Trim level | Higher trims with proximity entry use larger fobs that open differently than basic keyless entry fobs |
| Previous owner | Used vehicles sometimes have worn or damaged fob housings that are harder to open cleanly |
| Battery brand | Quality varies; cheap batteries may drain faster or have inconsistent voltage |
| Aftermarket fob | Replacement fobs bought through third parties may use different battery sizes than OEM units |
When a Battery Swap Doesn't Fix the Problem 🔧
If the fob still doesn't work after a fresh battery, the issue may not be the battery. Possible causes include:
- The fob lost its programming — this can happen after a battery swap if the fob needs to be re-paired to the vehicle. Some Subaru models require a specific re-pairing sequence; others reconnect automatically.
- Damaged internal contacts — if water got into the fob or the housing cracked, the circuit board may be corroded.
- The receiver in the vehicle — if multiple fobs fail, the vehicle's receiver module may be the problem.
Re-programming procedures vary by model and year. Your owner's manual may include the steps, or a dealership or locksmith with the right equipment can re-pair it.
What Your Specific Fob Requires
The exact housing design, battery type, and re-pairing steps depend on your specific Subaru model, model year, and whether the key is factory-original or a replacement. What works for a 2015 Outback flip key won't necessarily apply the same way to a 2022 Forester proximity fob. Your owner's manual is the most reliable starting point — and the battery compartment itself will confirm the right battery size once you're inside.