Lexus said that some 1999 RX300 models may turn on the check engine light and log trouble code P1133 in the powertrain control module (PCM).
If diagnosis doesn't turn up anything out of the ordinary, the problem is most likely due to internal problems in the air/fuel ratio sensor.
Replacing the sensor with an updated unit, Part No. 89467-48011, should eliminate further trouble, the company reported.
"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].
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