P0304 Nissan Sentra
Cylinder 4 Misfire Detected · Powertrain Code · High · Repair: Easy
What is P0304?
Misfire detected in cylinder 4. Typically caused by a worn spark plug, bad ignition coil, faulty fuel injector, or low compression in that cylinder.
When the Nissan Sentra triggers code P0304 (cylinder 4 misfire detected), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Nissan Sentra.
This repair is rated easy, meaning basic tools, no lift needed.
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 Nissan Sentra.
Common Causes on Nissan Sentra
- Failed ignition coil on cylinder 4
- Worn spark plug on cylinder 4
- Fuel injector failure or clogging on cylinder 4
- Vacuum leak near cylinder 4 intake port
- Low compression from head gasket or valve issue
Symptoms
- Check Engine Light on or flashing
- Rough idle
- Engine vibration
- Reduced power
- Risk of catalytic converter damage if ignored
Notes for Nissan Sentra
Replace all spark plugs together if they are past the 60k-mile interval for platinum plugs.