Toyota 89665-42290 Firmware Catalog Reference
Toyota 89665-42290 calibration catalog entry and the related 89665-42290-D identifier.
89665-42290 belongs to a Toyota calibration numbering family associated with engine control software. The related catalog entry is 89665-42290-D. Its suffix distinguishes the catalog identifier, but does not establish a particular modification or software feature.
Engine control software generally manages engine operation through functions such as fuel delivery and ignition timing. The exact vehicle application and the changes made by this calibration revision are not established by the identifier alone.