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Q:

over drive light comes on and off on 1992 Lexus LS400

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
over drive light comes on and off even when over drive button is on....
(1) Answer
You need to get your vehicle diagnose, with a scantool it may be a faulty sensor