Lexus RX 350 Firmware 89663-48S81
A catalog reference for Lexus RX 350 engine-control firmware 89663-48S81 and the 2GR-FKS V6.
89663-48S81 is a Lexus RX 350 engine-control calibration associated in the catalog with the 2GR-FKS V6. The 89663 part-number family identifies calibration software for the engine control module, which manages engine operation.
The engine control module uses sensor information to control functions such as fuel injection, ignition timing and electronic throttle response. Those controls affect how the V6 starts, runs and delivers power. The catalog identifies this calibration as RX350 2GRFKS 89663-48S81.bin, but it does not describe a specific change made by this revision.
Reading the catalog filename
The filename connects the full calibration identifier to an RX 350 with the 2GR-FKS engine. It carries no stock or modified variant label. The identifier and engine designation distinguish the entry, but the filename alone does not establish a model year or compatibility with every RX 350.