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Discussion Starter #1
So 2000 jetta tdi, the clip holding the 2 halves together was broke. Had another empty fob that wasnt identical to mine but my chip fit in it. So I changed things out. Put a new battery in my car has it had **** the bed. Go to start the car and the car doesnt recognize the key and it doesnt lock/unlock the doors. Switch everything back to the original fob and the car recognizes the key and starts but the fob wont lock/unlock the doors. New to these cars and alarm systems in general. So idk where to look to try and troubleshoot this issue so asking here to see if I can get some help. Also this key fob is the only one I have for the car, I dont a spare. Thanks.


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Discussion Starter #3
Yes I switched the chip an everything. When I put the chip an key into the new fob nothing worked and the car didnt recognize it, think it was a battery issue in the remote. So switched it all back to old fob, pictured above. And the recognizes the remote but the remote doesn't lock/unlock the doors or pop the trunk anymore.

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That's easy to fix with a VCDS. We actually have multiple Jetta's and a bug. All FOB's open all cars.
But, the small IMMO or transponder chip (https://www.google.com/search?q=vw+...CfwQ_AUIBygC&biw=414&bih=722#&biw=414&bih=722) is what's used to start and run the cars. This isn't battery powered. Its energized by RFID waves which cause it to vibrate at a certain frequency. If the chip from the replacement key was still there - this could have caused your issue

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Discussion Starter #5
What's vcds?

And yeah no the replacement key fob was a blank key and empty body. That's why I had to switch everything into it.

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