Toyota Firmware 89663-OCA91: Calibration Catalog Reference
A concise reference to Toyota firmware identifier 89663-OCA91 and its calibration part-number family.
89663-OCA91 is a Toyota firmware calibration identifier in the 89663 part-number family. That family is associated with engine control computer calibrations, which govern functions such as fuel delivery, ignition timing and emissions control.
The family association is tentative for this exact identifier. The identifier alone does not establish its vehicle application, the operating behavior of this calibration or any change made by a particular revision.