Assuming the battery was the problem and not the fob itself, it’s usually not difficult to replace the battery yourself. If ...

Many vehicles will also warn if the battery in the key is running low to avoid this situation, but we would suggest consulting your vehicle handbook for clarification. How long should a key fob ...

The fix is an obvious one: Subaru will replace the RES fobs for free ... The engine may continue to start and stop until the fob battery is depleted, or until the vehicle runs out of fuel.