I agree that it is a flase indicator when converting the vitz to CNG, but what if there is a problem? it's common only because our local fitters are idiots who cant do a complete conversion. if it is ok to have a check engine light on the vitz on CNG why is this not the case with the rolla and civic?
ask logas, or any other CNG guru and they'll tell you that a complete conversion means that everything works 100%,.. so a check engine light is ok for those who don't care to get something done right. those who do, should get the conversion done correctly.