Toyota 89663-26K41 Firmware Catalog Reference
A concise reference to Toyota firmware identifier 89663-26K41 and its calibration part-number family.
89663-26K41 is a Toyota calibration identifier in the 89663 part-number family, which is associated with engine control computer software. The family association suggests an engine-control application, but the exact vehicle, controller and software function cannot be established from the identifier alone.
An engine control module manages operating functions such as fuel delivery and ignition using sensor information. That general role does not establish what this particular calibration changes or whether it is a stock or modified variant.