Some 2007-09 ES350 sedans and 2007-10 RX350 SUVs with 2GR-FE engines may turn on the Check Engine light and store trouble code P0505 in computer memory. One likely cause, reports Lexus, is a bad idle air control (IAC) motor. Replacing the throttle body assembly (which includes the IAC motor) with an updated unit should eliminate the problem.
Before ordering the new throttle body, however, hook up a scan tool and look for codes other than the P0505. If you see any, take care of them first. If the only code logged is the P0505, check the PCV and air induction systems for leaks or loose connections. If both systems are okay, install the updated throttle body, part No. 22030-0P050, using a new gasket.
"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].