Toyota and Lexus Firmware 89663-6A120
A catalog reference for Toyota and Lexus firmware identifier 89663-6A120 and its control-module part-number family.
89663-6A120 is a Toyota or Lexus electronic control calibration identifier in the 89663 part-number family. That family is generally associated with engine control module software, which manages functions such as fuel delivery, ignition timing and emissions-related operation.
The association with engine control software is tentative for this exact identifier. The code alone does not establish its vehicle application, the behavior of this particular calibration or a change from an earlier revision.
What the identifier tells you
The complete identifier distinguishes this calibration from other Toyota and Lexus records in the same part-number family. It should not be treated as proof that a similar-looking calibration is interchangeable or that 89663-6A120 applies to a particular model, engine or model year.