what does PO300 code means

copy and paste the link below..don't drive it until fixed or converter will be destroyed! P0300 Hyundai Random/Multiple Cylinder Misfire Detected … www.engine-codes.com/p0300_hyundai.html

It means you have a cylinder misfire. but the computer has not seen enough information to determine which cylinder is misfiring. eventually it will set a code for a specific single cylinder misfire. The problem is if your car is misfiring it will eventually cause catalytic converter damage. I recommend getting the vehicle diagnosed immediately to keep any more issues from arising.