A p0304 is a cylinder misfire on number 4 cylinder. Possible causes are faulty spark plug wire, bad spark plug, or faulty ignition coil. Depending on how many miles are on the vehicle, you may just need a simple tune up.
What would cause a trouble code (P0174) ON A 2002 JAG X-TYPE
SOURCE: What is the meaning of 98 Honda Civic error codes
P0300 indicates that there is multiple miss fire in the ignition system. P0303 and p0304 indicates the miss fire is in cylinder #3 and #4. Replace the spark plug, and wire set, and rotor and cap if there is one. Can not remember if there are coil packs on the civic, the age thing. change the fuel filter and clean out the fuel injectors with fuel injector cleaner for the next 3 full ups. When the spark plugs are removed, inspect them for condition, if there clean or dirty with carbon build up. which would indicate how the engine is running. Keep me posted and drive safe.
SOURCE: p0304 p0344
I was trying to get meanings for codes on my care.. I called the dealer & got some good info..
SOURCE: what does the code P0304 mean?
cylinder 4 is misfiring. Could be plugs, coil, or an injector issue.
SOURCE: I have a 99 lincon
Misfire on cylinder #4
The O2 Code is a result of the misfire
not a problem with sensor
www.engine-light-help.com/generic-check-engine-light-codes.html
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