P0300 2006 Nissan Altima Sedan does this also cause white smoke coming from tail pipe?

Question

I have received 2 code (1) p0300 & p0301. I have already changed my spark plugs and still reading these codes on my car, also I have white smoke coming from my tail pipe and my engine is miss firing. What does the white smoke indicate is happening with these 2 codes?

Answer 1

check your coolant level, if its low you might have a damaged headgasket (very common on these cars) if you have a hard time starting the car that is also that is another cause of headgasket damage

if everything is fine you can try to swap the ignition coils, reset the light and see if the codes move over to the other cylinder you swapped ignition coils with