Toyota Lexus SW#89663-60522 MOD_E2_sap_off.bin: SAP-Off Firmware

SW#89663-60522- MOD_E2_sap_off.bin is a modified Toyota or Lexus engine-control firmware file labeled for secondary air injection pump, or SAP, operation to be switched off. In practice, the label indicates a change to software associated with the emissions system that pumps fresh air into the exhaust during cold starts to help the catalytic converters reach operating temperature.

The identifier 89663-60522 places the file in Toyota’s engine control calibration numbering family. The related catalog entry uses the same calibration number without a variant label. The full vehicle application and the exact software changes are not established by the catalog names alone.

What the modified label means

MOD_E2_sap_off identifies this file as a modified variant and names SAP-off as its intended change. It does not establish whether the pump command, diagnostic monitoring, or both have been altered. The E2 label is part of the variant name, but its specific meaning is not clear from the identifier.

The engine control module normally coordinates fuel injection, ignition and emissions-related functions using sensor inputs and stored calibration data. A secondary air injection fault can illuminate the malfunction indicator lamp, particularly when the system is checked during cold-start operation. A file labeled SAP-off is distinct from a documented Toyota repair calibration and may affect emissions compliance.