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This issue is very well documented on several forums. With 528, there doesn't seem to be a fix yet, but with the 535, there is a software update that fixes (transforms) this drivability issue with the the car. Warning: some of us who have had this done also are now seeing a couple of irritating new issues not before present -- surging idle RPMs at start and steering wheel phone on/off hook button not working with first try. Knowledgeable SAs know about this and are told a software patch is being worked on.
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