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I work at a BMW dealer and if a tuned car comes in and we read fault memory for any reason it will set a tuned fault. BMW monitors this situation and voids warranties all the time. This is true for modifying code for the CID and Kombi. Even if you remove the tune it will still show, it happens all the time and makes it hard to properly diagnose when they lie about the tune even though you can show proof.
 
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