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Discussion Starter · #1 ·
I have a 2004 golf and there is an intermittent issue with communications with the ECU. I've been told that the aftermarket stereo that was installed prior to purchasing could be the cause. I have been looking for a diagram of the connectors for the stereo to help. Does anyone have some info that could help?
 

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I am having the same issue with my 2002 337. I went to get a tune, and they said essentially the same thing; bummer there isn’t any responses.
 
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