sorry for reviving an old post. I got my Z about 2 weeks ago and noticed the high pitch noise problem. The dude at the dealership called the "high authorities" and they have admitted the high pitch ECU problem. What's strange is that the "high authorities" have told the technician that the ECU ending with A are malfunction and the ones ending with B are the newer revised ones and should fix the problem. Currently a "B" version is ordered...and leaving me all confused about this A and B issue.
Again, sorry for bringing up this topic again
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