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I struggled with an issue for MONTHS where the key fob worked FINE for locking/unlocking the car, but the car would NOT detect it once I was sitting in the car until I took it out and waved it around in the cabin.
I tried replacing the fob battery to no avail. I finally connected the dots when I realized that this consistently occurred when the car had been sitting for any length of time, but never happened when I, say, got back into the car after leaving it for a short period of time.
I replaced the CAR battery. Turned out the OEM battery had gotten just a bit weak. It still started the car without any issue, but apparently it was causing the web of keyless entry antennae spread throughout the car to act up. Battery was replaced a month ago and I haven't had a single issue since.
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