NASCAR officials penalized the No. 17 RFK Racing Ford team for a detached wheel during last Sunday’s Cup Series race at Las Vegas Motor Speedway.

Chris Buescher finished last in Sunday’s Pennzoil 400 after his right-front wheel became unfastened, and his crash into the outside retaining wall forced a caution period in the 28th of 267 laps.

No. 17 crew members Nicholas Patterson (jack) and Jakob Prall (front tire changer) were suspended for the next two Cup Series events — through the March 17 race scheduled at Bristol Motor Speedway.

Lug nut violations:

In the Xfinity Series, the crew chiefs for two teams were docked $5,000:

No. 9 JR Motorsports Chevrolet (crew chief Phillip Bell)
No. 42 Young’s Motorsports Chevrolet (crew chief Andrew Abbott)

A single Craftsman Truck Series team was penalized with a $2,500 fine:

No. 98 ThorSport Racing Ford (crew chief Joe Shear Jr.)