P0304: Falha de ignição detectada no cilindro 4
Falha de ignição detectada no cilindro 4: Combustion misfire isolated to Cylinder 4.
| Trouble Code (DTC) | P0304 |
|---|---|
| Official SAE Definition | Falha de ignição detectada no cilindro 4 |
| Vehicle Subsystem | powertrain |
| Driving Severity | HIGH |
Observable Symptoms
- Engine vibration
- Loss of power
- MIL on
Most Probable Root Causes
- Cylinder 4 spark plug or ignition coil degradation
- Fuel injector restriction
- Head gasket or exhaust valve wear
Step-by-Step Diagnostic Procedure
- Swap Cylinder 4 coil with Cylinder 1 or 3
- Check spark plug for oil or coolant fouling
- Run relative compression test