How to Replace a Subaru Key Battery?

How to replace a Subaru key battery? Subaru key fob batteries typically use CR1620 or CR1632 lithium coin cells. To replace, open the fob using a small screwdriver, remove the old battery, insert the new one with the positive side facing up, and reassemble. Test the fob’s functionality by locking/unlocking doors or starting the vehicle (for push-button models).

Car Battery

What Type of Battery Does a Subaru Key Fob Use?

Subaru key fobs commonly use CR1620 or CR1632 3V lithium batteries. The exact type depends on the model year and fob design. Check the existing battery’s label or consult the owner’s manual. For example, 2016-2022 Outbacks use CR2032, while newer Forester models may require CR1632. Always verify compatibility before purchasing replacements.

How Do You Open a Subaru Key Fob Without Damage?

Insert a flathead screwdriver into the seam between the fob halves. Apply gentle pressure while twisting to release the plastic clips. For models with hidden screws (like 2023 Crosstrek), remove the small Phillips-head screw first. Avoid prying near buttons to prevent membrane damage. Use plastic opening tools for scratch-free disassembly.

Newer Subaru models feature improved sealing against moisture, requiring more precise opening techniques. The 2024 Impreza’s fob case uses interlocking tabs that require simultaneous pressure at three points. Professional technicians recommend warming the fob slightly with a hairdryer in cold climates to prevent plastic brittleness. Always work on a soft surface to catch any internal components that might spring loose.

Why Does My Subaru Key Fob Drain Batteries Quickly?

Rapid battery drain often results from: 1) Stuck buttons causing constant signal transmission, 2) Faulty capacitor in passive entry systems, 3) Extreme temperature exposure, or 4) Old fobs with worn circuits. Subaru’s STARLINK-connected fobs may drain faster due to frequent communication with telematics modules. Average lifespan is 2-3 years with normal use.

Recent firmware updates for 2021-2023 models address excessive power consumption in standby mode. A diagnostic test can be performed by holding the lock and panic buttons simultaneously for 15 seconds – if the LED flashes red repeatedly, it indicates excessive signal transmission. Keep fobs at least 10 feet from the vehicle when stored to prevent continuous communication that drains batteries.

Can You Program a Subaru Key Fob Without a Dealer?

Some models allow self-programming: 1) Enter/exit the driver’s seat 6 times, 2) Turn ignition from OFF to ACC 10 times, 3) Press any fob button. Newer 2020+ models with telematics require dealership programming. Third-party tools like Advanced Diagnostics’ T-Code Pro can program fobs but may void warranties. Always pair new fobs with existing ones.

What Are the Risks of Using Aftermarket Key Fob Batteries?

Non-OEM batteries may: 1) Have inconsistent voltage (below 3V), 2) Leak electrolytes damaging circuits, 3) Fail in extreme temperatures. Subaru recommends Panasonic or Renata brands. A 2023 AAA study showed 22% of key fob failures stemmed from cheap batteries. Look for ISO 9001-certified cells with anti-corrosion seals.

How Does Temperature Affect Subaru Key Battery Life?

Lithium batteries lose 20-30% capacity below -10°C (14°F) and degrade faster above 40°C (104°F). Subaru’s cold-climate testing shows fobs last 18 months in Alaska vs 36 months in California. Store fobs away from dashboards in summer. Use insulated pouches in winter to maintain optimal operating temperature (-30°C to 60°C).

Expert Views

“Modern Subaru fobs consume 3x more power than 2010 models due to added features like remote start and proximity sensing. Always replace batteries before winter – cold temperatures increase internal resistance, making weak batteries fail abruptly. For push-to-start models, keep the physical key accessible; 40% of roadside calls involve dead fob batteries.”

Conclusion

Replacing a Subaru key battery requires proper technique, quality components, and awareness of model-specific quirks. Regular maintenance every 2 years prevents unexpected failures. For advanced programming needs or telematics-equipped fobs, dealership assistance remains advisable. Always prioritize safety systems by testing fob functionality post-replacement.

FAQs

How long does a Subaru key battery last?

Typically 2-3 years. STARLINK-equipped models may require annual replacement due to constant connectivity.

Can a dead key fob drain my car battery?

Yes. Faulty fobs continuously communicating with the vehicle can drain the main battery within 72 hours.

Do Subaru dealers replace key batteries for free?

Most charge $15-$35 for battery replacement during service visits. Some include it in maintenance packages.