Sainz denied hitting any quadbikes during Saturday's fourth stage and Peugeot indicated they would appeal.
"Nobody really can understand this penalty," Peugeot Sport head Bruno Famin told motorsport.com. "This leaves the door open to anything. If any competitor can say that he almost collided with another, we will all have a 10-minute penalty."
Koolen, a former chief executive of online hotel reservation website booking.com, had complained that double world rally champion and 2010 Dakar winner Sainz had hit his quadbike and failed to stop.
There are five stages remaining to be run in the event which started in Lima, Peru, and ends in the Argentine city of Cordoba on Jan 20.
Monday's ninth stage was cancelled as a result of bad weather.
(Reporting by Alan Baldwin, editing by Pritha Sarkar)
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