P0300 code and Mazda warming protects automat

Thank you all for your councils, I had not had time to check the car or thank you, because I continue with the temperature probelma and bells, the code ta arranged, I will see I reviewed the time this week and notify them as it went, referring to the temperature it happens if it demands a lot and I do not know so much. By the way I check the spark plugs and so dry it can be the sensor Knock I do not ask how I can determine whether good or bad they made me comment that I could be the cause of the bell or that the time band is stretched thanks again I hope they continue helping me