uncontrolled emergency lamp

as some of u may aware that i posed previously about a flat battery... i fixed with giving the car a new one. BUT prior to battery replacement, the emergency lamp just flashed by
itself and can't be switched off (so the battery was drained)... and now the situation was not fixed... (even some people said the flashing emergency lamp may be due to the dying battery)
what could cause the emergency lamp to flash by itself (even with key removed). anti-theft system was removed 3 years ago.
thank you.
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