At 11.50pm on Saturday (28) one crew from Gamlingay and one crew from Potton in Bedfordshire were called to a fire on Potton Road in Guilden Morden.
Firefighters arrived to find a car on fire and extinguished it using a hose reel. They returned to their stations by 2am.
The cause of the fire is believed to be deliberate. Anyone with information should contact police by visiting www.cambs.police.uk to submit an online report or call Crimestoppers on 0800 555111.