Toyota and Lexus Firmware 89665-30B31

89665-30B31 is a Toyota or Lexus calibration identifier in the 89665 part-number family, which is commonly associated with engine control module software. Its association with an engine-control calibration is tentative because the exact vehicle application and controller are not established here.

An engine control module manages functions such as fuel delivery and ignition timing using information from engine sensors. Those decisions affect how the engine starts, runs and responds to the accelerator. The identifier alone does not establish which of these functions was changed by this particular calibration.

Use the complete identifier 89665-30B31 when comparing a service record or controller calibration. A similar prefix is not enough to establish that another calibration has the same application or behavior.