The site was created by YOC Group, which has been charged by PistonHeads' owner, Haymarket Consumer Media, with developing mobile versions of a number of its publications, including What Car?, Autocar and Stuff.tv.
As well as being designed and built by YOC, the agency will also manage the ad sales and create mobile marketing campaigns to generate awareness to drive traffic.
Sandip Ray, business director for Haymarket's motoring brands, said of the launch: "The launch of mobile.pistonheads.com using YOC's technology and specialist sales resource is the first step for Haymarket toward a robust commercial strategy in the mobile space.
"This is an important development for us and our advertisers as we deliver a new platform to reach our audiences on the move."
Haymarket Consumer Media is part of Haymarket Media, which also owns Brand Republic.