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

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.

by in Evansville, IN on May 02, 2011
2 answers
ANSWER by , May 02, 2011
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 by , May 04, 2011
ventilation line restriction in gas line.