He said the fire, which required a callout of more than two hours to control, destroyed the car and spread to macrocarpa trees and a shed on the side of the road.
A police spokesman said inquiries were ongoing to determine how the fire in the Ford Courier car started.
Fire crews were then called to a car engulfed in flames in a rural area near the intersection of Chambers St and Eriksen Rd in Napier.
A Fire and Emergency NZ spokesperson said they extinguished the blaze and handed the suspicious fire over to police to investigate.
A police spokesman said they were investigating.