A 39-year-old man died in the hit-and-run accident last Saturday in the southern port city.
Officers previously rounded up five of six young people known to be in the German car involved.
Police arrested the suspect at the home of his parents in Marseille’s 13th arrondissement, according to media reports.
Police earlier arrested one of the passengers of the vehicle on Thursday night in a special home at Avignon for students in need of educational help.
Two other minors believed to be in the car were picked up on Monday, while a further two were placed in detention after being arrested on Saturday.
They face various charges, including involuntary manslaughter, illegal possession of firearms, auto theft and the sexual assault of a woman whose car was stolen.
The scooter incident is the latest of a slew of deadly crimes that have dogged Marseille.
On Thursday, a man in his 30s was injured in a gun battle with police before being arrested.
He was wanted in the death of an officer Eric Lalès who died in November 2011 while in pursuit of burglars in Vitrolles, a community in the Bouches-du-Rhône department, FranceTVinfo.fr reported.