check engine

[Takimo]

ok kind of bad news, the other post i talk about replacing valve cover gasket, and following the repair on my way home i get a check engine, so i went back to the garage and he told me its a gas trim code and he will erase it and come back if the check engine come again... but it never came... what it mean ? problem went away ? or problem still here but ECM took in consideration we knew the problem and wont show a check engine since it was erase ??


theres no way the problem disappear by magic in my believe so whats the bottom line ???