2004 Toyota Corolla Verso 1.8vvti 94k Have the same eng men light with tcs &vsc light on (because they are connect to E.M). Emissions check says all is perfect but computer say cat weak. Cleaned 02 sensor but still happens. Running on super unleaded. Performance great. It seems to happen when the fuel tank read just above half, yet no significant suck when I undo the filler cap. Will keep monitoring the fuel level to see if it the vent cap as some US sights say.
Brian Bridle, December 2016