P0304 Code Embarking on a Mission of Diagnostic Excellence

What does code P0304 mean? It means “Cylinder 4 Misfire Detected.” Code P0304 indicates that Cylinder 4 of your car's engine misfired numerous ... hi to all i have a 2002 VW Passat estate 2.0. i recently had the code p0304 come up misfire cylinder 4 and replaced the plug furthest away ... Compression test is a must at this minute. If compression is low, check valves. If compression is ok- injector, coil, spark plug, wiring is to blame. My truck is throwing the P0304 code for misfire on cylinder #4. I went ahead and changed all the spark plugs, wires, distributor cap, rotor, and ignition coil. ... Switch the ignition coil assembly between 4 & 6 and see if you then get a p0306. If so, change the ignition coil. If that doesn't yeild any results, check for an intake manifold gasket leak. You can do this with a boost leak check or spray some brake clean ... The error code is showing a P0304: meaning Cylinder 4 is having missfires. Recommendation is to replace the ignition coil and the spark plug. A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4. Single cylinder misfires are usually plugs, coils, fuel injectors or bad wiring somewhere. Given your post I'd be looking at the fuel injectors ... P0304 is for cylinder 4 misfire. That would be my next step. You don't have to change all the ignition coils out. Just the one for cylinder 4.