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Nissan Repair/random misfire p300


HI Calvin, I have a 04 maxima sl that"s been giving me a code of p300 random misfire. According to the technician at nissan, I was told to change the rear coils so i did and still misfiring,then I was told to change all spark plugs and still misfiring.I then tried to also change the crank sensor since it"s a little off timing but no luck,still getting the code p300 and still misfiring. I don"t know what could it be and I don"t want to spend any more money.Please help.

Hi Luis -

Here is the list of things to check associated with the code P0300:

Faulty spark plug (s)
- Faulty ignition coil (s)
- Clogged or faulty fuel injector (s)
- Spark plug to coil wires
- Intake air leak
- Fuel injectors harness is open or shorted
- Fuel Injectors circuit poor electrical connection
- Ignition coils harness is open or shorted
- Ignition coils circuit poor electrical connection
- Insufficient cylinders compression
- Incorrect fuel pressure

Hope this helps -


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Calvin Iwashita


All general car repairs for all models of vehicles, except technicals (overhauls) on A/C systems and transmissions.


16 years as a car mechanic from 1974 to 1990, and still repair cars on the side.


High School and college graduate

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