How Much Does It Cost To Fix A Blown-Out Spark Plug

When you encounter a blown-out spark plug, it can be an unexpected and potentially costly automotive repair. A blown-out spark plug can lead to poor engine performance, misfires, and even engine damage if not addressed promptly. In this article, we will explore the factors that influence the cost of fixing a blown-out spark plug and provide a rough estimate of what you can expect to pay for this repair.

Understanding the Problem


Several factors influence the cost of fixing a blown-out spark plug:

1. Vehicle Make and Model

The cost can vary depending on the make and model of your vehicle. High-performance or luxury cars may require more expensive parts and labor.

2. Labor Costs

Labor costs can vary widely depending on your location and the repair shop you choose. More specialized or experienced mechanics may charge higher labor rates.

3. Parts

The cost of the spark plug itself is relatively low, but if there is damage to the cylinder head or other components, you may need additional parts, such as a new cylinder head or thread repair kits.

4. Severity of Damage

The extent of damage caused by the blown-out spark plug plays a significant role in determining the cost. If the damage is limited to the spark plug threads, the repair may be relatively straightforward and less expensive. However, if the cylinder head is damaged, it can significantly increase the cost.

5. Additional Repairs

Sometimes, when a spark plug blows out, it can lead to other issues in the engine, such as damaged valves or piston heads. If these components are affected, the repair costs can escalate.

6. Repair Shop Choice

Different repair shops may offer varying price quotes for the same repair. It’s essential to obtain multiple quotes to ensure you’re getting a fair price.

Estimated Costs

While the cost of fixing a blown-out spark plug can vary widely, here are some rough estimates to give you an idea:

  • Simple Spark Plug Replacement: If the damage is limited to the spark plug threads and no other components are affected, you might pay between $100 to $300 for parts and labor.
  • Cylinder Head Repair: If the cylinder head needs to be repaired or replaced, the cost can range from $500 to $1,500 or more, depending on your vehicle and the extent of the damage.
  • Additional Repairs: If other engine components are damaged, you could be looking at a total repair cost ranging from $1,000 to $3,000 or more.


DescriptionParts Cost ($)Labor Cost ($)Total Cost ($)Time Required (hrs)
Replace Spark Plug5-1005-100.5 – 1
Purchase Helicoil Kit10-20010-201 – 2
Total15-30015-301.5 – 3

Professional Repair Shop

DescriptionParts Cost ($)Labor Cost ($)Total Cost ($)Time Required (hrs)
Diagnose & Replace Spark Plug5-1050-10055-1101 – 2
Helicoil Repair10-20100-200110-2202 – 4
Complete Cylinder Head Repair50-200300-800350-10004 – 8

Average Costs by Vehicle Type

Vehicle TypeAverage Cost ($)
Compact Car55-220
Luxury Car100-1000

Additional Costs

Additional CostsEstimated Cost ($)
Towing to Repair Shop50-150
Diagnostic Fee50-150
Rental Car (if needed)30-50 per day
Spark Plug Wires20-50
Ignition Coil50-100

Factors Affecting Repair Costs

FactorImpact on Cost
Vehicle Make & ModelModerate
Severity of DamageHigh
Location of Repair ShopLow
DIY vs. ProfessionalLow
Warranty CoverageLow



Fixing a blown-out spark plug is not a one-size-fits-all repair. The cost can vary significantly based on various factors, including the severity of the damage and your vehicle’s make and model. To ensure you get an accurate estimate, it’s advisable to consult with a reputable mechanic or repair shop. Remember that addressing the issue promptly can prevent further engine damage and potentially save you money in the long run.


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