Cylinder 4 Misfire Detected
Powertrain Code · High
What does P0304 mean?
Misfire detected in cylinder 4. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
System: Ignition
P0304 is a powertrain diagnostic trouble code indicating cylinder 4 misfire detected. This code is classified as high severity, which means: address soon — may cause further damage. We have vehicle-specific diagnostic data for 43 models below. Select your vehicle for tailored causes, symptoms, and repair cost estimates.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your vehicle.
See causes, symptoms, and repair costs for P0304 on specific vehicles: