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P0304 OBD-II Trouble Code: Cylinder 4 Misfire Detected
P0304 code definition P0304 is a diagnostic trouble code seen when a misfire is detected in cylinder 4. This code may be seen with other misfire codes and lean / rich...

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Check Engine light P0304.
The code P0304 points to a misfire on cylinder number 4. Ford also has a funny cylinder identification pattern, different from many makes, and a diagram should be consulted to determine which cylinder is the right one. The spark plugs...
Getting error code P0304
Since you are getting a misfire code on the #4 cylinder that will cause the computer to shut off these other systems. The misfire needs to be fixed first. Most of the time when this comes up it is caused...
Car misfires when driving 45+ mph for extended period of time
The code P0304 is a misfire on cylinder number four. The reason it is misfiring at cruising speed is that is when the engine is running its leanest and the coil is finding an easier path to ground than through...
Getting error code P0304
P0304 means the engine computer has detected a severe misfire on cylinder 4. This could be due to a bad ignition coil, spark plug, fuel injector, or valve train issue. If the issue is not resolved, further damage to the...
P0304 Misfiring on Cylinder 4
Hello. If the spark plug and the coil have been replaced, then a compression test needs to be done. It is common for the valve seat to fail and cause this. When it fails, it causes low compression which then...
Don't understand CEL Codes.
The codes P0300 through P0306 are for misfires of random cylinders or different cylinders. The second code P1456 is for the evaporative fuel tank system having a leak somewhere in the system. Since you are getting random misfires, then I...
Car stalling when stopped
The codes all reference engine misfires. Continued misfires can cause the catalyst to fail and block the exhaust. The past diagnosis you had that the coils could be bad was correct. The coils and plugs should be replaced first and...
Cylinder 4 misfire
It sounds like you may need an ignition control module. It's a small device mounted around the right front of the engine compartment. It has a plug with about a dozen wires connected. The module has a separate channel for...
Grinding noise of the engine with P0340 code
Code P0340 is a camshaft sensor fault. The cam sensor is responsible not only for determining cam position, but it also is used by the engine computer for cylinder identification to set up both ignition firing sequence and sequential injection...

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