Generally I have found that when this code or one ending in another number (example P0304) can mean that the coil pack is bad. When I get the code that's what I usually had to replace. Here is a website that may help you out ....
http://www.obd-codes.com/p0300
Insert the key into the ignition and turn it to the "ON" position. There is no need to start the car.
Press the button located in the center of the instrument cluster ONCE. The display should now read "OIL LIFE" instead of vehicle mileage.
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