While a dying battery is the most common cause, several factors can trigger this code:
If you have never heard of the B1A10, you are not alone. Lost between the canvas-and-wood biplanes of the 1920s and the deadly zeros of the 1940s, the Mitsubishi B1A10 represents a seismic shift in Japanese military aviation. It was Japan’s first indigenous, all-metal, low-wing monoplane bomber.
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Most B1A10 issues are resolved by simply replacing the key fob battery.
When you press the "Lock" or "Unlock" button on your key fob:
42B-B1A10 Keyless/KOS key 1 low battery - Mitsubishi Tech Info