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If I am not mistaken, modern remote car locks have digital ID codes and each one of them have unique ID and all these run at same frequency. The TX and RX are matched ones and the RX responds to its TX only. This technique makes very less chances of interference. If you change the frequency, i don't think it will work for other car.
I just heard about: take a simply receiver on remote controller frequency, and connect the output to laptop microphone input. When the remote controller work, You can make recording the bitstream.With wawe editor can see the timing and combinations.This method doesn't work with hopping-code systems.