After two weeks driving our new smartcar with no problems, the engine malfunction warning light came on. Called 800-smartusa. After telling me to check fuel cap (no help), told me to bring to nearest dealer - 100 miles away! Found this site and a posting to try disconnecting battery cable for 5 minutes. When reconnected, heard clicking sound and the radio came on -- strange since ignition switch was off. Cranked it up and no light nor radio problem.

Thanks smartfor2guy.