Rally organizers said Sunderland, the overall leader on a KTM, withdrew near the end of the 330-kilometer (205-mile) special around San Juan de Marcona when he was hurt after a jump.
Adrien van Beveren of France won the fourth stage in about four hours. He also moved into the overall lead, taking a 1:55 advantage over Pablo Quintanilla of Chile.
In the car race, the 40-year-old Villas-Boas was in 43rd position for team Toyota at the time of his accident. There was no word on whether the former Porto, Chelsea and Tottenham coach was staying in the competition.
Loeb and Peterhansel swapped checkpoint leads. Loeb finally led through the fourth and last checkpoint while Peterhansel, whose overall lead wasn't in trouble, stopped to change a tire hanging off the rim.
Loeb beat Carlos Sainz by 95 seconds, followed by Peterhansel for a Peugeot sweep of the podium. Peterhansel leads overall by 6:55 over Loeb.
The former champions who started the day second and third overall dropped out of title contention.
Cyril Despres, the five-time champion on a bike who was lying second in a car, had a broken rear wheel after hitting a rock at about 180 kilometers, and his rally appeared over. Nasser Al-Attiyah, the two-time champion who won stages one and three, became stuck in sand three times and fell almost an hour off the pace.
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