Greg Biffle of Roush Fenway Racing is 18th in the Sprint Cup Series standings.
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NASCAR has issued written warnings to four teams on the heels of the Quaker State 400 NASCAR Sprint Cup Series weekend at Kentucky Speedway.
The teams of drivers Casey Mears, Greg Biffle, Alex Kennedy and Brett Moffitt were all hit with warnings for issues in inspection.
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According to the Sprint Cup Rule Book, a team that receives two warnings during two consecutive events faces a P1 level penalty that could include one or more of the following sanctions from NASCAR: Deduction of practice time, deduction of qualifying time, last choice in selecting pits, delay in order of inspection and/or other penalties.