P0304
P0304 means "Cylinder 4 Misfire Detected". Severity: 🔴 High. Avoid driving if possible — this can cause damage or be a safety risk. Get it diagnosed right away.
What the P0304 code means
| Code | P0304 |
| Definition | Cylinder 4 Misfire Detected |
| System | Powertrain (engine & transmission) |
| Type | Generic (SAE standard) |
| Subsystem | Ignition System or Misfire |
| Severity | 🔴 High |
Common causes of P0304
- Faulty plug/coil on cylinder 4
- Injector issue
- Compression loss
How to fix P0304
- Replace plug/coil on cylinder 4
- Check injector and compression
Always confirm the diagnosis with a scan tool and live data before replacing parts.
Is it safe to drive with P0304?
Avoid driving if possible — this can cause damage or be a safety risk. Get it diagnosed right away.
P0304, answered.
What does P0304 mean?
P0304 stands for "Cylinder 4 Misfire Detected". It is a generic (sae standard) OBD-II powertrain trouble code.
Is it safe to drive with a P0304 code?
Avoid driving if possible — this can cause damage or be a safety risk. Get it diagnosed right away.
What causes P0304?
Common causes include: Faulty plug/coil on cylinder 4; Injector issue; Compression loss.
How do you fix P0304?
Typical fixes: Replace plug/coil on cylinder 4; Check injector and compression. Always confirm the diagnosis before replacing parts.