Our test of a 2021 BMW M550i xDrive showed the car fell significantly short of BMW's claimed zero-to-60-mph time of 3.6 seconds. We alerted BMW to the discrepancy. The company eventually deduced that a software problem was causing a communication error between the car's stability control system and its engine computer, which caused turbocharger boost pressure to drop. BMW said it will roll out software updates to the owners of all affected cars (2021 M540i xDrive models are also impacted) starting this summer. What has Motor Trend done for you lately?

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