The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video, we explain what OBD2 code P0304 means and possible causes.
P0304 means cylinder number 4 is experiencing misfires. A misfire occurs when an insufficient amount of fuel is burning in a cylinder. The efficient burning of fuel is essential to engine operation as the combustion of fuel is what provides the energy to power the engine. A misfire from one or more cylinders can be caused by many reasons from a faulty ignition system, fuel system, or internal engine failure.
When P0304 occurs, it should be fixed immediately as long term driving with engine misfires could cause consequential damage to your engine. Many times, P0304 occurs when there are worn out spark plugs, spark plug wires, or a faulty ignition coil.

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0:00 P0304 - Cylinder 4 Misfire
0:40 What is a Misfire?
0:56 Four Stroke Combustion Cycle Explained
1:31 What Causes a Misfire?
1:37 Common Cause of P0304 - Vacuum Leak
1:55 Common Cause of P0304 - Fuel Leak or Congestion
2:20 Common Cause of P0304 - Ignition Coil or Spark Plug
3:35 Other Possible Causes of P0304
4:14 Happy Driving!

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