Toyota and Lexus Firmware 89663-48S03
A catalog reference for Toyota and Lexus firmware 89663-48S03 and its engine-control calibration family.
89663-48S03 is a Toyota or Lexus engine-control calibration identifier in the 89663 part-number family. Calibrations in this family are associated with engine control module software, which manages functions such as fuel delivery, ignition timing and emissions controls.
The identifier alone does not establish the exact vehicle application or the change made by this revision. Its complete suffix, 48S03, is important when distinguishing this calibration from other records with a similar prefix.