How much does spark plug replacement cost?
$130 - $300 typical range
Spark plug replacement typically costs $130 to $300 for a standard four- or six-cylinder engine. The final price depends on the number of plugs, whether they use premium iridium or platinum tips, and how hard they are to reach.
Get free spark plug replacement quotesWhat is Spark Plug Replacement?
Spark plug replacement removes the worn plugs that ignite the fuel-air mixture and installs new ones to restore smooth ignition.
Signs you need spark plug replacement
- Rough or shaky idle
- Engine misfires or hesitates on acceleration
- Hard starting or slow cranking
- Check-engine light or misfire code
- Drop in fuel economy
What affects the cost
- Number of cylinders (4, 6, or 8 plugs)
- Copper vs. platinum vs. iridium plugs
- Engine layout and plug accessibility
- Whether ignition coils are replaced too
- Vehicle make and model
- Shop labor rates in your area
Get an exact spark plug replacement price
The range above is a starting point — your year, make, model and parts set the real number. Describe the job once and verified local shops send you free quotes.
Get free quotesSpark Plug Replacement cost — FAQ
How often should spark plugs be replaced?
Copper plugs generally last 20,000 to 40,000 miles, while platinum and iridium plugs can last 60,000 to 100,000 miles. Check your owner's manual for the exact interval for your vehicle.
Can I drive with a bad spark plug?
You can drive short distances, but a fouled plug causes misfires that waste fuel and can overheat and damage the catalytic converter. It is best to replace worn plugs promptly to avoid a much larger repair bill.
Should I replace all spark plugs at once?
Yes, plugs wear at a similar rate, so replacing them as a full set keeps ignition even and saves on labor. Mixing new and old plugs can lead to uneven performance and repeat visits.
Do I need to replace ignition coils with spark plugs?
Not always, but coils and plugs work together and often wear on a similar timeline. If a coil is already failing or the shop finds one during service, replacing it at the same time can save labor.
What are signs of worn spark plugs?
Common signs include rough idling, engine misfires, hard starting, reduced fuel economy, and a check-engine light. If you notice these symptoms, have the plugs inspected before they cause a misfire code.
