Toyota Lexus SW#89663-60C35-MOD_E2_sapoff.bin Firmware

SW#89663-60C35-MOD_E2_sapoff.bin is a modified engine-control firmware entry identified with Toyota calibration 89663-60C35. Its sapoff label indicates a variant intended to disable secondary air injection, an emissions-control function used during cold starts.

What the SAP-off label means

A secondary air injection system introduces fresh air into the exhaust during a cold start. This helps the catalytic converter reach its effective operating temperature and reduces emissions while the engine and exhaust are warming up. The engine control module manages the system’s operation and monitors it for faults.

The MOD_E2_sapoff.bin suffix identifies this file as a modified variant with a named SAP-off function. In practice, that label suggests a change to the engine-control software’s secondary air injection behavior or monitoring. The filename alone does not establish the exact changes made inside the file.

How the catalog identifiers relate

The related entry 89663-60C35 is the base calibration identifier. It does not itself carry the modified SAP-off label. The full filename adds MOD_E2_sapoff.bin, distinguishing this variant from the base identifier. The meaning of E2 and the precise vehicle application are not established by the catalog name.

Engine-control calibration identification matters when diagnosing a secondary air injection fault because the controller’s software determines how it commands and checks the system. A SAP-off label describes a software modification, not a repair of the pump, valves, wiring or other components. It can also affect emissions compliance.