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My car came with 2 key fobs but one was badly worn out and buttons was not working. I ended up repairing it myself (I'm electronic engineer). You can buy buttons online and replace it, if you got some soldering skill. But even after replacing buttons on mine it never worked. I ended up desoldering battery compartment and underneath on a board located main IC (chip) which controls fob. After close look I found some of the pins on main IC (chip) are not tide to board (over time, vibrations cause the solder to separate from the board. you may not see it but you can try to bend a pin on IC a bit and you will feel if its loose. I will not recommend bend the pins!, just re-solder it). I ended up re-soldering pins and it worked! I understand this is not easy DIY, but I thought its good to shear.
Regards,
ArmenT
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