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When you take your car in for a diagnostic the tech will link your vehicle to ISTA. If ISTA finds anything that’s consistent with an after-market tune it will give the tech an alert that states “suspicion of engine tuning”. BMW has been working hard on being able to identify this. BMW has been burnt a lot with engine tuning in the past.
One of the maintenance items that BMW does under warranty with each warranty maintenance service is called a standard scope inspection. They automatically scan the vehicle for fault codes. That’s regardless if there are any current faults showing (like a check engine light).
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