Spark Plug Replacement cost
Spark Plug Replacement typically costs $155 to $390 at an independent shop, parts and labor included, and most shops book about 30 minutes to 2 hours for the job.
Spark plugs ignite the fuel in each cylinder. Worn plugs cause rough running and misfires and quietly cost you fuel economy. The plugs themselves are inexpensive; the cost mostly comes from how much has to be removed to reach them.
Typical cost
Parts and labor at an independent shop. Your exact price depends on the car, your area, and the parts chosen.
What the job involves
- Remove the ignition coils or plug wires
- Remove the old plugs and check their condition
- Gap and install the correct new plugs
- Torque them to spec so they seal properly
- Reassemble and confirm smooth running
What moves the price
- The number of cylinders
- Plug type: long-life iridium costs more than copper
- Access, since some engines require removing the intake
- Whether the coils or wires are replaced at the same time
Signs you may need it
- A rough idle or a noticeable misfire
- Hard starting or hesitation on acceleration
- A drop in fuel economy
- A check-engine light for a misfire code
How long it lasts
Depending on the plug type, spark plugs last anywhere from 30,000 to 100,000 miles.
U.S. drivers say they couldn't cover an unexpected car repair without taking on debt — which is exactly why knowing the fair price before you say yes matters.
Sources & further reading
- AAA — Car repair and maintenance costs — independent guidance on what repairs should cost
- U.S. Bureau of Labor Statistics — Automotive service technicians & mechanics — the official data behind shop labor rates
- FTC — Auto repair basics — your consumer rights at the repair shop
Cost ranges and guidance reviewed July 2026.
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Spark plugs FAQ
Spark Plug Replacement: common questions
How much does spark plug replacement cost?
Spark Plug Replacement typically costs $155 to $390 at an independent shop, including parts and labor. Your price mainly depends on the number of cylinders and plug type: long-life iridium costs more than copper.How long does spark plug replacement take?
Most shops book about 30 minutes to 2 hours for spark plug replacement. Typical steps: remove the ignition coils or plug wires; remove the old plugs and check their condition.How do I know if I need spark plug replacement?
Common signs include a rough idle or a noticeable misfire; hard starting or hesitation on acceleration; a drop in fuel economy. If you notice these, it is worth having the spark plugs checked.How long should the spark plugs last?
Depending on the plug type, spark plugs last anywhere from 30,000 to 100,000 miles.
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