My car is lexus i.s.250 2011 petrol saloon, problem I have is this, after filling up with petrol, I found that the filler cap would not screw back in fully, and the fuel "flap"would not lock into position, just kept springing open. Even when I remove the filler cap the "fuel" flap will still not lock shut, just springs open. Anybody out there can possibly help? GLINNY.