P0304 Code Explained The Ultimate Diagnostic Resource

... P0304 code this past Sunday (4/24). I reset my ECU and the car ran fine until the next day (about 70 miles later) when the code popped up again. Cylinder 4 in is the plug next to the gearbox not the middle. The lead is most likely the fault. Regards, Merlin. 2017 Edge Ti 2.0L shows P0304. The spark plugs were changed and I swapped ignition coil 4 to 1 spot. The code was cleared and 2 days later ... The P0304 code will be seen in cars where the ECU has detected that cylinder 4 is not firing properly. The ECU monitors the operation of all cylinders to ensure ... Code p0304 and engine light on. Mechanic's Assistant: Has your vehicle stalled? Has anyone run a diagnostic test to pull the trouble code? The code is showing a misfire on Cylinder 4. The actual code is P0304. I changed the spark plug but that wasn't it. She seems to be running a little rough when ... Initial possibilities off the top of my head: Bad coil pack, Bad spark plug, Bad injector. If it is under warranty have it towed to the dealer. I would only replace ignition coil on cylinder 4 and replace all of your spark plugs. With fresh spark plugs you can expect the rest of the coils to last long. If the coil was bad it should set cylinders 1 & 4 misfire codes. (in theory) Unbolt the coils and with the engine running lift the coils up one ... Defective AA head on 3.6L motors built before 7/26/12. Inevitable failure but good news for you is that warranty is extended to 150,000 miles as ...