Some 2005-09 Scion tC models may turn on the check engine light and store one or more EVAP system trouble codes in computer memory. The codes you might encounter are P0455 and P0441 together, or P0456 separately.
All are attributable to an evaporative system leak caused by a poor fit between the gas cap and fuel filler pipe. Installing redesigned parts should eliminate further trouble. Order part No. 77201-21100 for the filler pipe; part No. 77300-33070 for the new cap.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].