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Just a little quirk I recently discovered: I was having issues with my fob being detected inside the vehicle. The car would unlock and lock just fine, but once I sat down, it wouldn't let me start because it couldn't detect the fob (yellow light on the dash) until I took it out of my pocket and waved it around. At first it was intermittent, but it slowly became more consistent. I replaced the battery in the fob, to no avail.
Fast forward one month, and my car is at the dealership for a new transmission, and when they went to work on the car, the battery was COMPLETELY dead, and it wouldn't start. They charged it, and it was fine again, but I noticed the car was getting a bit more sluggish turning over when starting.
That's when I made the connection. My key fob only wouldn't be detected by the car after the car had been sitting for a while (AKA, when the battery hadn't been recently topped-off). So I replaced my CAR battery, and not only does my car more energetically now, but it detects the key fob without any issues, and has for weeks without a single hiccup. So it seems like even a slightly weak battery, while still plenty strong enough to start the car, can cause the keyless entry antennae in the car to lose their sensitivity.
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