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I had issues with mine being able to read the fob from inside the car for many weeks. A new fob battery did nothing. My car battery died when I left it at Subaru over the weekend for some warranty work, and that got me thinking that perhaps the sensor array in the car was sensitive to reduced voltages, and that my issues were actually a heads up that my OEM battery was on its way out.
New car battery and I no longer had any fob issues. And yes, my fob issues tended to be more likely to occur after the car hadn't been driven for longer periods of time - because the battery would be topped of immediately after any drive, and so caused no issues during brief periods of inactivity.
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