Maintenance
Spark plug replacement: what it costs
Wide range: this job varies a lot. Itemize your quote for a better answer.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $20 | $120 |
| Labor: 0.6 to 2.5 hours × $110 to $150 an hour | $66 | $375 |
| Fees: shop supplies, disposal, diagnostics | $0 | $15 |
| Total, rounded | $85 | $510 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
Worn spark plugs are replaced with new ones so the engine fires cleanly. Signs of wear include rough idle, poor mileage, hard starts and misfire codes.
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What is usually included
- New spark plugs for each cylinder
- Gap check where needed
- Inspect coil boots and connectors
- Torque to spec
- Clear codes and test drive
What moves the price
- Four, six or eight cylinders
- Copper, platinum or iridium plugs
- Plugs under intake parts on some V6s
- Seized or broken plugs that take extra time
Questions to ask before you say yes
- Which plug type does my car need?
- Are coil boots or coils checked?
- Is the price per plug or for the full set?
- Do you use anti-seize or torque specs for my engine?
Can you do it yourself?
A good DIY on easy engines with a torque wrench and a socket; cross-threading or overtightening can wreck the cylinder head.
Shopping for the part? Search car parts on eBay (affiliate link, disclosure). Make sure the part fits your car before buying.
Common questions
How often do spark plugs need replacing?
Copper plugs last about 30,000 miles, while iridium or platinum often last 60,000 to 100,000. Your manual lists the interval.
Can old plugs cause a misfire code?
Yes. Worn plugs are one of the most common reasons for a misfire code, along with bad coils. Cheap to rule out early.
Why do some jobs cost much more?
Some V6 and boxer engines hide plugs behind other parts, so it takes hours to reach them. A four-cylinder with easy access is much cheaper.
How much does spark plug replacement cost?
A typical range across the US is $85 to $510. That is an estimate from parts prices, labor hours and the local labor rate, not a quote.
Typical range in 10 metro areas
Only the labor rate changes between cities. Same parts, same hours.
| Area | Typical range, estimate |
|---|---|
| Boston area, Massachusetts | $95 to $580 |
| New York City area | $90 to $550 |
| Los Angeles area, California | $90 to $560 |
| Chicago area, Illinois | $85 to $530 |
| Houston area, Texas | $80 to $500 |
| Dallas-Fort Worth area, Texas | $80 to $500 |
| Phoenix area, Arizona | $85 to $510 |
| Atlanta area, Georgia | $85 to $530 |
| Miami area, Florida | $80 to $510 |
| Seattle area, Washington | $95 to $560 |