If your Subaru’s key fob battery is dead, you can usually start the car by using the mechanical key blade or by triggering the push-button start with the fob held near the start area. Replace the fob battery as soon as you can. This guide outlines the two main methods and notes model variations.
Emergency ignition using the key blade (mechanical key)
The mechanical key blade is hidden inside the fob. Some models provide a dedicated ignition slot or a nearby area where you can insert the blade to wake the system and start the engine.
- Slide out the mechanical key blade from the fob. Look for the release latch on the fob and remove the blade.
- Inspect your Subaru for a hidden ignition slot or access point near the steering column or Start/Stop area. If your model has a slot, insert the key blade and turn it as you would a traditional ignition (ON, then START).
- If there is no traditional slot, insert the blade into the indicated area and press the brake pedal, then press the Start/Stop button (or turn the ignition if required by your model) to start the engine.
- Once the engine is running, remove the blade and stop using the emergency method. Plan to replace the fob battery as soon as possible.
- Close or secure any access covers after starting, if your model uses a cover over the slot.
Conclusion: The key blade method provides a reliable backup when the fob’s battery is dead, but the exact slot location and procedure can vary by year and trim. If you can’t find the slot, proceed to the proximity method or consult the owner's manual.
Proximity start with a dead fob
If your model supports it, you can start the engine by holding the fob near the Start/Stop button (or the designated proximity area) and pressing the brake while initiating start. This method relies on the fob’s near-field communication being read despite a dead battery.
- Sit in the driver’s seat with the vehicle in Park (P) and the brake pedal pressed firmly.
- Place the dead fob against the Start/Stop button or the nearby proximity target as indicated in your manual. Common spots are very close to the button or a small pad on the dash/center console.
- With the fob in place, press the Start/Stop button to start the engine. If needed, hold the button for a moment or try a second attempt after repositioning the fob.
- If the engine starts, drive to a safe location and replace the fob battery as soon as possible.
- If the car does not respond after several attempts, the fob battery may be too weak to be read; consider roadside assistance or consult the manual for a model-specific procedure.
Conclusion: Proximity start is a commonly recommended fallback for push-button Subarus, but success varies by model and year. Check your manual for the exact location of the proximity sensor or any special steps required for your vehicle.
Model-specific notes
Because Subaru's push-button start and keyless systems have evolved over different years and trims, the exact emergency-start locations and steps can vary. If you’re unsure, consult your owner's manual or contact Subaru roadside assistance for model-specific guidance.
Summary
For a Subaru with a dead key fob, you typically have two reliable options: use the mechanical key blade to access an emergency ignition or use proximity start by holding the fob near the Start/Stop control while pressing the brake. In either case, replace the fob battery as soon as possible and refer to your model’s manual for any location-specific details. If all else fails, seek roadside assistance to avoid getting stranded.