Engine won't start

what are the definitions for those codes ?

P0300 multiple misfire p0302 is miss on cylinder 2 and po523 is high voltage at oil pressure sensor

I would replace the oil sensor , see what the plugs look like or if the wires are old and worn , see if the injectors are all firing normal , with one misfire you can swap things to see if the problem moves but with multiple it may be something across the board