Toyota 89663-42S90 Firmware for the 2019 RAV4

89663-42S90 is a Toyota engine control calibration identifier listed for the 2019 RAV4. The related service-record identifier, 8966342S9000, appears as an updated calibration in two Toyota service bulletins.

What the calibration controls

The 89663 part-number family is associated with engine control module software. The engine control module manages engine operation using sensor inputs to determine commands such as fuel delivery and ignition timing. Its calibration affects how those controls respond under different operating conditions.

The available bulletin records identify 8966342S9000 as an updated calibration in T-SB-0107-19 and T-TCI-5267. They do not specify the bulletin topics here, so a particular driving symptom or improvement cannot be attributed to this revision.

Catalog identification

The associated file is named 89663-42S90.bin. Its name carries the calibration’s part-number form but does not include a stock or modified variant label. The 2019 RAV4 is the vehicle named in the service records, although an exact vehicle configuration is not established by the filename alone.