A faulty airbag likely led to the death of man involved in a crash in Sydney's south-west last week.

The man, 58, was driving a Honda CRV when it collided with a Toyota Celica last Thursday at the intersection of Mallee and Church Streets in Cabramatta.

A man in his 50s died after a crash in Cabramatta last week. Credit:Seven News

A NSW Police investigation found he died at the scene after being struck in the neck by a small fragment.

He was travelling with a woman, who was treated at scene for non-life threatening injuries. The driver and passenger of the Toyota, both men, were also treated at the scene with minor injuries.