1992 Lexus LS400 Q&A

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

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. -
Answer 1
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 2
ventilation line restriction in gas line. -