Code P0304Immediate
Cylinder 4 Misfire Detected
Cylinder #4 isn't firing - your engine is running unbalanced, causing shaking and power loss.
Need This Code Diagnosed?
Free code scanning • Professional diagnosis • Fair pricing
Immediate Action Required
This issue can cause significant damage if ignored. Stop driving if experiencing severe symptoms.
Recommended Actions:
- •Pull over safely if engine is misfiring badly
- •Call for professional diagnosis immediately
- •Do not ignore flashing check engine light
- •Avoid highway driving until repaired
What This Code Means
The #4 cylinder is not firing properly, affecting engine performance.
"Cylinder #4 isn't firing - your engine is running unbalanced, causing shaking and power loss."
Common Causes
Failed spark plug cylinder 4
Bad ignition coil cylinder 4
Fuel injector failure cylinder 4
Valve problems cylinder 4
Head gasket leak affecting cylinder 4
Symptoms You May Notice
Professional Diagnostic Steps
Our technicians will perform these checks:
Commonly Affects These Vehicles
Note: This code can appear in any vehicle. These are just the most common.
Repair Cost Breakdown
Why Choose Us?
- ASE Certified Technicians
- Latest Diagnostic Equipment
- Warranty on All Repairs
- Upfront, Honest Pricing
- Same Day Service Available
Frequently Asked Questions About Code P0304
Can I keep driving with code P0304?
Avoid driving except to repair shop - protect your catalytic converter
How much will it cost to fix P0304?
The repair approach depends on the specific cause and your vehicle.The most common cause (failed spark plug cylinder 4) usually costs on the lower end of this range.
Will code P0304 clear itself?
While the check engine light may turn off if the condition improves temporarily, the code will remain stored in your vehicle's computer. The underlying issue still needs to be addressed to prevent the code from returning and potentially causing damage.
Is P0304 covered under warranty?
Coverage depends on your vehicle's warranty status and the specific component that failed. Extended warranties may cover this repair.
Don't Guess - Get Professional Diagnosis
Code P0304 can have multiple causes. Our diagnostic process ensures we fix the right problem the first time.