Supercars championship leader Scott McLaughlin will have to start Sunday's Sandown 500 from the rear of the grid after an engine rule breach at last month's Bathurst 1000.
Stewards announced on the morning of the 500km endurance race that McLaughlin's Ford Mustang had run an engine during qualifying and the top 10 shootout at Bathurst which "exceeded the maximum permitted valve lift" under regulations.
As a result McLaughlin and co-driver Alex Premat, who qualified fifth for the Sandown race, will now start alongside Shane Van Gisbergen and Garth Tander at the back of the grid.
DJR Team Penske have been fined $30,000 for the breach while McLaughlin has been stripped of his pole position and lap record from Mount Panorama.