I have a 03 gti and i put an aftermarket stereo in it and i had to do it professionally because the stock stereo is ran through the ECU? or maybe it was a built in amp of some sort. either way there was a wire harness that had to be put in because what ever the stereo was runing through so was someother things so i couldnt bypass it....just the harness was $150.
dont know if it would be different for a 02 jetta. but thats wat i had to do.
i normaly put my own in but i ran into this problem.
Call cartoys or somewhere and ask.
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