Firefighters found a car burning in woodland off Wentworth Road, Blacker Hill, Barnsley, in the early hours of yesterday.
The blaze, discovered at 3.10am, destroyed the car leaving it unrecognisable.
Crews working on Thursday night into Friday morning across the county were also called out to deal with a hedge set alight on Brocklehurst Avenue, Kendray, Barnsley, a skip torched on Limpsfield Road, Brightside, Sheffield, and grassland fired on Highthorn Road, Kilnhurst, Rotherham.
A garage was also set alight in an arson attack on Hill Street, Elsecar, Barnsley.
■ Witnesses or anyone with information about who started the blazes should call South Yorkshire Police on 101, or Crimestoppers anonymously on 0800 555 111.