if fault occurred after fueling the car then take a look at the fuel as have had problems with ethanol based fuel reacting to water in a bad way its almost like slime when water is mixed
only know this due to an Audi a looked at last year
regarding p0300/1/2/3/4 could be caused by manifold air leek,fuel pressure low,week crank sensor output blocked exhaust incorrect reading from coolant temp all a good idea to investigate.
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