A NASCAR official said after the race that a Johnson crewman was being investigated for modifying the side skirt on Johnson’s car during the race.
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NASCAR implemented new rules prior to this season preventing teams from modifying the side skirts during a race. NASCAR also has new video cameras monitoring pit road, making such rules violations easier to detect.
Any possible penalties would be announced next week.
Johnson, a four-time winner of the all-star race, finished 15th Saturday after slapping the wall early in the race.