Engine Error
P0304
Cylinder 4 Misfire Detected
Severity
High
Symptoms
Stalling at stops, poor fuel economy, rough running
Common Causes
- Worn spark plug
- Faulty coil
- Injection circuit issue
- Head gasket leak
How to Fix
- 1 Replace spark plugs
- 2 Replace ignition coil
- 3 Test injector wiring
- 4 Check coolant for oil contamination
Estimated Repair Cost
USD
$100
–
$1500
Coil/Plug: $150; Head gasket: $1,200+