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Q: check engine light due to gas cap being loose or worn,is what i was told. on 1992 Lexus LS400

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check engine light is on .had it diagnosted I was told the gas cap was causing problem,I changed cap and light is still on.
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It takes two "drive cycle trips" to "turn off" the light. The computer looks at certain criteria before it will naturally turn off the light, if not a scan tool is required to turn off the light.
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