The Ford F-150 code P0304 is indicating that cylinder 4 is mIS Firing at random times. The first thing You should do to pinpoint the issue is to check for intake leaks. If there are no leaks found You can replace the spark plugs on cylinder 4. The possible warning signs of the problem can be the engine light illuminated, lack of power, hard starting, and engine hesitation when at idle speeds. Sometimes it can be another issue as there have been a service bulletin put out by Ford stating that the P0304Code can due to a PCM software issue and You will have to reprogRam the Powertrain control module. The cost for a diagnosis from an auto service shop will range from $100 - $150 depending on how long and labor-intensive the diagnosis is.
Jared C.
April 10, 2020
The p0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 4.
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