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As soon as the battery dies it also wipes th interna; memory of your car's frequency. Happened to me. put a new battery in myself then took it to Arnold Sharks. forked out an extra £80 to finish the job
Is it definitely the Key? Does the red LED on the key still blink?
If its not the key then its to do with the receiver on the car. This happened on the missus' 182. The blippers on the keys worked but the car didn't unlock.
Does it click at all, the plastic button on the key I mean? If so could be battery, if not, the tiny switch will most likely have broken off the circuit board. If it's the later, try taking it to a electrical repair place or even a watch repairers. Electrician at work fixed mine.