Question about 1997 Volkswagen Jetta

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1997 Jetta - OBD2 Code Reader problem...

I have 1997 Jetta GLS, the check engine light is on. I went and got a CanOBD2 code reader, but when I plug the code reader in, and turn the ignition to the ON position, I'm getting an error message on the reader. It says "Unable to establish a link with the vehicle." According to the symbols on the reader, it's properly powered through the vehicle's DLC, and the reader is communicating (linked) with the vehicle's on-board computer.
Does anyone know if this code reader may not work for my Jetta, and if not would you know which type of code reader would work.

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Encrypted software to stop weekend mechanics?sorry but this is becoming a big problem and the newer the car the bigger the problem

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