Lexus RX 350 Firmware 89663-48620
A catalog reference for Lexus RX 350 2GR-FE firmware 89663-48620 and its Toyota engine-control calibration family.
89663-48620 is a Toyota engine-control calibration identifier cataloged for the Lexus RX 350 with the 2GR-FE engine. It belongs to the 89663 calibration family associated with engine control module software. The engine control module manages functions such as fuel delivery and ignition timing, which affect how the engine runs and responds to the driver.
What the catalog identifies
The filename Lexus RX350 2GRFE 89663-48620.bin connects this identifier with the RX 350 and its 2GR-FE engine. The shorter 89663-48620.bin entry carries the same identifier without the vehicle description.
A separate entry, 89663-48620-A, adds an A suffix. The catalog does not describe that suffix as a stock designation or identify a modified function, so it should not be taken as evidence of a particular software change.
The identifier describes a calibration in the engine-control family, not a documented list of changes made by this revision. The vehicle and engine named in the catalog provide useful identification context, but do not establish compatibility with every RX 350 fitted with a 2GR-FE engine.