Nissan Altima 03

Asked by Cowboy28 Mar 28, 2017 at 12:34 AM about the 2003 Nissan Altima 2.5 S

Question type: Maintenance & Repair

Hi I was given a Nissan Altima and it ran good for
two weeks no check engine no problems then out
of nowhere it died on me got it home changed fuel
pump got it going again and now I have a code of
p0300 cfn/ p0300 pdn how do I fix the problem

1 Answer
223,755

Rowefast answered 7 years ago

P0300 NISSAN - Cylinder Misfire Detected Random Cylinders...Possible causes; Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s), 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...The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem......

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