Spark Plug Replacement Cost

Replace worn spark plugs to restore ignition performance and fuel economy.

$100 – $400

Typical labor: 30 minutes to 2 hours

Parts vs Labor

35% / 65%

Typical share of total cost

Labor Time

30 minutes to 2 hours

At a typical shop

Difficulty

Confident DIY

2 of 5

Prices are national averages. Your exact cost depends on your vehicle, location, and shop. Get a free personalized AI estimate above.

Common Symptoms

Rough idle or misfires

Check engine light with misfire codes

Drop in fuel economy

Hesitation when accelerating

Spark plugs create the spark that ignites the air and fuel in each cylinder. They wear out gradually as the electrode erodes.

Worn plugs cause misfires that damage the catalytic converter, a much more expensive part to replace.

Iridium plugs cost more upfront but last 80,000 to 100,000 miles vs 30,000 for copper
On 4-cylinder engines this is a very DIY-friendly job if you have basic tools

Shops commonly pair spark plug replacement with these jobs to save on overlapping labor:

Check if your shop quote is fair before paying. Get a free line-by-line AI estimate for your year, make, and model in under a minute, then compare.

How often do spark plugs need replacing?

Iridium plugs every 80,000 to 100,000 miles. Copper or platinum plugs every 30,000 to 50,000 miles.

Should I replace coils at the same time?

Only if a coil is bad. Coils don't wear out on a schedule the way plugs do.