Toyota and Lexus SW#89663-60E74- MOD_E2_sap_off Firmware
A catalog overview of SW#89663-60E74- MOD_E2_sap_off and its secondary air injection modification label.
SW#89663-60E74- MOD_E2_sap_off is a modified Toyota or Lexus engine-control calibration cataloged with a secondary air injection off label. Secondary air injection helps reduce exhaust emissions during cold starts by introducing fresh air into the exhaust. The sap_off label indicates that the modified file is associated with disabling that function, although the identifier alone does not show the exact software changes.
What the calibration controls
The 89663 part-number family is associated with engine control software. An engine control module manages engine operation, including fuel delivery, ignition and emissions-related functions. Secondary air injection is one such emissions system, typically active for a limited period after a cold start.
The catalog also lists 89663-60E74 without the modification suffix. That entry identifies the corresponding base calibration, while MOD_E2_sap_off distinguishes the modified variant. The separate E2 label is present in the modified filename, but its precise meaning is not established by the catalog name.
The calibration identifier and filename do not establish an exact vehicle application or the extent of any diagnostic changes. In practical terms, the distinction is between the base engine-control calibration and a variant named for a secondary air injection modification.