Peterhansel took the lead in the car class on the second stage and retained command all the way to the finish on the 12th and 220 km long final stage.
The finish was between Yanbu and Jeddah in Saudi Arabia.
For Peterhansel, it was a wonderful anniversary.
30 years ago, he won the rally for the first time, then in the motorcycle class.
Then there have been five more motorcycle victories and now eight wins in the car class.
The last stage was won by the stablemate, the Spaniard Carlos Sainz.
The double rally world champion finished third in the competition, almost two hours behind Peterhansel.
Kevin Benavides, Honda, got to celebrate his first victory in the Dakar Rally's motorcycle class. The Argentine was almost five minutes faster than brand colleague Ricky Brabec, USA