IndyCar president Doug Boles said Wednesday that "absolutely it's a miss" that Team Penske raced with modified attenuators for at least a year before an IndyCar tech team member finally caught the infraction Sunday prior to qualifying for the Indianapolis 500.

The two Team Penske drivers will start from the final two spots on the grid after being penalized for violating rules during qualifying weekend.

Josef Newgarden and Will Power will start from the back at the Indy 500 after the latest rules violation involving Team Penske.

Two-time defending Indianapolis 500 winner Josef Newgarden and Team Penske teammate Will Power will have to start from the final two spots on the grid Sunday.

One of the major stories from Sunday’s qualifying sessions at the Indianapolis 500 was Team Penske withdrawing both the No. 2 car of Josef Newgarden and the No. 12 car of Will Power, after technical inspections found a modified attenuator on both cars.

Issues discovered on Penske's Nos. 2 and 12 cars Sunday was also displayed on Newgarden's 500-winning car last year displayed at the IMS Museum.

The first half of the two-phase Indianapolis 500 qualifying procedure took place to set positions seven through 12, and the results were absolutely unexpected as all three Team Penske cars failed to turn a lap as a result of Scott McLaughlin’s crash a few hours earlier and a failure

Two-time IndyCar champion Josef Newgarden has offered insight into why the current generation of IndyCar machines is proving more difficult to drive around the Indianapolis Motor Speedway.