Toyota/Lexus SW#89663-60C21-MOD_2_sap_off.bin Firmware

SW#89663-60C21-MOD_2_sap_off.bin is a modified Toyota or Lexus engine-control software file labeled for secondary air injection off. The named function concerns the system that supplies extra air to the exhaust during cold starts to help the catalytic converter reduce emissions.

The 89663-60C21 identifier associates the file with Toyota’s engine ECU calibration family. The related catalog entry uses the same identifier without the modification suffix. The exact vehicle application and the changes inside this particular file are not established by the filename alone.

What the SAP-off label means

Secondary air injection typically operates briefly after a cold start. Its pump and valves direct fresh air into the exhaust, supporting faster catalyst warm-up and lower cold-start emissions. The engine ECU controls and monitors that operation.

The sap_off suffix identifies this file as a variant intended to switch off that function. The filename does not establish whether the modification disables pump commands, diagnostic monitoring, or both. MOD_2 identifies it as a modified variant, but does not describe its individual calibration changes.

For diagnostic purposes, the distinction matters: a modified file labeled SAP off is not evidence that the original 89663-60C21 calibration has the same behavior. Disabling emissions controls can also affect emissions compliance.