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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1992 Lexus LS400 Question: check engine light due to gas cap being loose or worn,is what i was told.
Answer #1patrick mannion from Greg Solow's Engine Room, May 02, 2011, 21:14Master
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.
Answer #2Visitor, May 04, 2011, 21:32
ventilation line restriction in gas line.