Toyota and Lexus Firmware 89663-22170-A

89663-22170-A is a Toyota or Lexus firmware identifier associated with the related catalog entry 89663-22170. The 89663 part-number family is commonly associated with engine control software, so an engine control module association is tentative.

An engine control module manages functions such as fuel delivery and ignition timing. The available catalog identifiers do not establish which vehicle uses this calibration, which engine functions this specific revision changes, or what the -A suffix denotes.