Police are appealing for witnesses after a Ford Fiesta was deliberately set alight in Nevill Road, Uckfield, in the early hours.
The car was gutted by the blaze which happened at 12.15am on Tuesday 11 September.
East Sussex Fire and Rescue attended and put out the fire. Another car parked nearby suffered slight damage.
A suspect who was seen near the car is described as male, aged between 25 and 30, six feet tall, of athletic build and wearing a dark hoody and jeans.
Detective Constable Richard Holder said: “We would like to hear from anyone who saw anything suspicious around that time. Call Sussex Police on 101 quoting serial 0019 of 11/9.”