Code P0303Immediate
Cylinder 3 Misfire Detected
Cylinder #3 is misfiring - like having a runner with a injured leg, the engine struggles and shakes.
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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 #3 cylinder is not firing properly, causing engine performance issues.
"Cylinder #3 is misfiring - like having a runner with a injured leg, the engine struggles and shakes."
Common Causes
Worn spark plug cylinder 3
Defective ignition coil cylinder 3
Clogged fuel injector cylinder 3
Low compression cylinder 3
Carbon buildup on valves
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
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Frequently Asked Questions About Code P0303
Can I keep driving with code P0303?
Minimize driving - misfires can cause $2000+ catalytic converter damage
How much will it cost to fix P0303?
The repair approach depends on the specific cause and your vehicle.The most common cause (worn spark plug cylinder 3) usually costs on the lower end of this range.
Will code P0303 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 P0303 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 P0303 can have multiple causes. Our diagnostic process ensures we fix the right problem the first time.