The incident left him with a broken rib.
Aguero, who has since flown back to Manchester, could be out for up to two months.
The 29-year-old is set to miss 11 games during his enforced lay-off, including City’s trip to Chelsea tomorrow, as well as two World Cup qualifiers with Argentina.
His father, Leonel Del Castillo, told TyC Sports: “The taxi was driving very fast, Kun asked him to slow down, put on his seat belt and crashed instantly.
“He was lucky. They put him on painkillers, he was released and taken to Manchester.”