The battery in your Subaru key fob comes out from the side, takes a CR2032 coin cell, and takes about two minutes to swap
Most Subaru key fobs use a CR2032 battery, a flat coin-shaped cell you can buy at any pharmacy, grocery store, or hardware store for two to five dollars. The fob itself does not need tools — you pry it open by hand along a seam on the side, lift out the old battery, and drop in the new one with the flat side facing up. The whole job takes longer to find your keys than to do it.
The exact steps depend slightly on which Subaru model year you own, but the principle is the same across nearly all recent Subaru fobs. If your fob is older than 15 years, the battery type or opening method may differ, and you should check your owner's manual or contact a Subaru dealer for the specific model.
Key Takeaways
- Subaru key fobs almost always use a CR2032 battery, which you can buy at any drugstore or supermarket for a few dollars.
- The fob opens by hand along a seam on the side — no screwdriver or special tool is needed.
- Insert the new battery with the flat side facing up, and the fob will work when ready.
- If your fob is more than 15 years old, check your owner's manual because the battery type or opening method may be different.
How to open the fob and remove the old battery
Look at the side of your key fob for a thin seam or slot. This is where the two halves of the fob meet. Insert your fingernail or a flat object like a coin or butter knife into the seam and gently twist or pry. The fob will pop open into two pieces — one half holds the circuit board and battery, the other is just the plastic shell.
Once the fob is open, you will see a small round battery sitting in a metal holder. The battery is usually held in place loosely, so it may fall out when you open the fob. If it does not, gently pry it out with your fingernail or a plastic tool. Do not use a sharp metal object that could scratch the circuit board.
Installing the new battery
Take your new CR2032 battery and look at it. One side is flat and shiny (the positive side), and the other side is slightly raised or textured (the negative side). Place the battery into the metal holder with the flat side facing up toward the top of the fob. This is the most common orientation, though some older Subaru models may be reversed — if the fob does not work after you close it, open it again and flip the battery.
Make sure the battery sits flat in the holder and is not tilted or stuck at an angle. If the holder has small metal tabs or springs, the battery should rest against them naturally without forcing.
Closing the fob and testing it
Align the two halves of the fob so the seam matches up evenly on all sides. Press them together firmly until you hear or feel a small click. The fob should snap shut and feel solid — if it feels loose or wobbly, open it again and make sure the battery is seated properly and the two halves are aligned.
Test the fob by pressing the lock and unlock buttons. The lights on your Subaru should respond when ready. If nothing happens, open the fob again and check that the battery is facing the right direction (flat side up) and that it is making good contact with the metal holder.
What battery type your Subaru uses
The CR2032 is a 3-volt lithium coin cell, 20 millimeters wide and 3.2 millimeters thick. You will see this exact designation on the battery package. Do not buy a CR2025 (which is thinner) or a CR2016 (which is even thinner) by mistake — they will not work reliably in a Subaru fob. The CR2032 is the standard, and it is the most common battery sold in stores, so you should have no trouble finding one.
A CR2032 battery typically lasts between three and four years in a key fob, depending on how often you use the buttons. When the battery starts to die, the fob will work only at very close range or will require you to press the button multiple times. That is your signal to replace it.
If your fob still does not work after changing the battery
If you installed a new battery and the fob still does not work, first check that the battery is facing the right direction. Open the fob again and flip the battery — some older Subaru models have the flat side facing down instead of up. Test the fob again.
If flipping the battery does not help, the problem may be a dirty contact or a broken circuit board. Try cleaning the metal contacts inside the fob with a dry cloth or a pencil eraser to remove any corrosion or dust. If the fob still does not work, the circuit board may be damaged, and you will need to replace the entire fob. Contact a Subaru dealer or a locksmith for a replacement.
Where to buy a CR2032 battery
You can buy a CR2032 battery at almost any pharmacy, supermarket, or hardware store. Common places include CVS, Walgreens, Target, Walmart, Home Depot, and Ace Hardware. You can also order them online from Amazon or eBay. A single battery usually costs between two and five dollars, though buying a pack of four or more is often cheaper per battery.
Make sure the package says CR2032 — do not buy a generic "coin cell" without checking the model number. Many stores stock these batteries near the checkout counter or in the electronics section, so they are straightforward to find. If you cannot locate one in your area, ordering online takes one to two business days for delivery.
Frequently Asked Questions
Can I use a different battery type in my Subaru key fob?
No. The CR2032 is the correct battery for nearly all recent Subaru fobs. A CR2025 or CR2016 is too thin and will not make proper contact. Using the wrong battery can damage the fob or cause it to malfunction. Stick with CR2032.
How long does a CR2032 battery last in a key fob?
A CR2032 typically lasts three to four years, depending on how often you press the buttons. Heavy use shortens the life. When the fob starts to work only at close range or requires multiple button presses, it is time to replace the battery.
What if I lose the battery when I open the fob?
If the battery falls out and rolls away, buy a new one — they are cheap. Do not try to reuse a battery that has been dropped or lost, as it may have internal damage you cannot see. A new CR2032 costs two to five dollars and is worth the peace of mind.
Do I need to reprogram my Subaru key fob after changing the battery?
No. Changing the battery does not erase the fob's programming. Once you install the new battery and close the fob, it will work when ready without any reprogramming steps.
What should I do with the old battery?
Do not throw a used battery in the trash. Most pharmacies and electronics stores have battery recycling bins near the checkout or customer service desk. You can also take old batteries to a local hazardous waste collection site. Check your city or county website for drop-off locations.