Toyota and Lexus 89663-60B81-TUN_E2_SAPoff.bin Calibration

89663-60B81-TUN_E2_SAPoff.bin is a modified Toyota or Lexus engine-control calibration labeled for the secondary air pump to be off. The secondary air injection system normally supplies fresh air to the exhaust after a cold start, helping the catalytic converter reach effective operating temperature and reducing emissions during warm-up.

What the filename identifies

The base identifier 89663-60B81 belongs to Toyota’s engine-control calibration part-number family. An engine control module uses calibration data to manage functions such as fuel delivery, ignition and emissions controls. The base catalog entry identifies the calibration family, but does not establish a specific vehicle application on its own.

In the full filename, TUN identifies a tuned or modified variant. SAPoff indicates that the secondary air pump function is disabled in that variant. In practice, this label points to a change in how the engine-control software handles that emissions system, rather than a general change to every function the module controls.

The E2 label is also part of this variant’s filename, but its exact meaning is not established by the catalog entry. The filename alone does not show the full extent of the software changes or confirm compatibility with a particular vehicle.