Drew Blickensderfer, crew chief for Aric Almirola and the No. 43 Richard Petty Motorsports Ford, was fined $10,000 by NASCAR for not having all the lug nuts properly installed on the car.
The infraction was discovered during post-race inspection after the Daytona 500.
Almirola finished fourth in the Daytona 500 behind winner Kurt Busch, Ryan Blaney and AJ Allmendinger.
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Blickensderfer, who was the only Monster Energy NASCAR Cup Series crew chief fined for a violation at the Daytona 500, was penalized under NASCAR Rule Book Sections 10.9.10.4: Tires and Wheels Note: Lug nut(s) not properly installed.
In the NASCAR XFINITY Series, Patrick Magee, crew chief of the Johnny Davis-owned No. 01 Chevrolet driven to a 10th-place finish by Harrison Rhodes, was fined $5,000, also for improperly installed lug nuts.