Spark plug replacement cost
Most shops charge $95–$400 in labor, plus $30–$120 for the set of spark plugs.
Updated November 2026
Where good SwaxFix bids tend to land: the low end, because shops compete for the job.
See what shops near you will actually charge.
Free to post. Shops bid blind: they see your car, never you. Buy the part yourself, shops bid on labor only. Already have a quote? Check if it’s fair.What the job involves
The shop removes the ignition coils, unscrews the old plugs, checks their condition for clues about engine health, and torques in new plugs. On many V6 engines the rear plugs sit under the intake plenum.
Signs you need it
- Rough idle or shaking
- Misfire or flashing check-engine light
- Hard starting
- Worse fuel economy
What changes the price
- Four-cylinders are quick. Transverse V6s often need the intake removed
- Iridium plugs cost more but last up to 100,000 miles
- Worn coils are often replaced at the same time
Shop or do it yourself?
Easy on many four-cylinders. Do it on a cold engine to avoid damaging threads.
Questions drivers ask
How much does spark plug replacement cost?
At a typical shop, labor runs $95 to $400 (about 48 min to 2.5 hr of work), and the set of spark plugs costs about $30 to $120. That puts most jobs between $125 and $520 total. With SwaxFix you can buy the part yourself and have local shops bid on the labor only.
How often should spark plugs be changed?
Most modern iridium or platinum plugs last 60,000 to 100,000 miles. Check your maintenance schedule.
Should I replace the ignition coils too?
Only if one is failing. Coils are not a scheduled part.
Can bad plugs hurt my engine?
Misfires can overheat and ruin the catalytic converter, a far more expensive repair.
Find a shop
Want to compare shops first? Browse auto repair near me, or post your job and let them come to you.