As a result , Darian Grubb replaced him as crew chief .
Johnson 's car failed pre-race inspection and as a result his crew chief , Chad Knaus was suspended for the first four races and the team was fined $200,000 .
Darian Grubb replaced crew chief as crew chief .
Johnson 's car failed pre-race inspection and as a result his crew chief , Chad Knaus was suspended for the first four races and the team was fined $200,000 .