How much does it cost to replace all 4 spark plugs?
What drives the cost?
Parts price: spark plugs by type
Below are typical price ranges for four plugs, organized by plug type. Note that actual prices vary by brand, vehicle compatibility, and whether the plugs are aftermarket or OEM.
Copper spark plugs
- Typical price per plug: $2–$7
- Estimated total for four: $8–$28
Platinum spark plugs
- Typical price per plug: $6–$15
- Estimated total for four: $24–$60
Iridium or long-life spark plugs
- Typical price per plug: $8–$40
- Estimated total for four: $32–$160
Labor costs and time
The labor component covers the mechanic’s time to remove the old plugs, inspect ignition components, and torque the new plugs to specification. Accessibility varies widely by engine design, which makes labor estimates more variable than part prices.
- Typical replacement time: 0.5–1.5 hours for straightforward engines; significantly more in engines with hard-to-reach plugs or required disassembly.
- Average shop rate in the United States: roughly $75–$150 per hour (higher in urban or high-cost areas, lower in cheaper regions).
- Estimated labor cost range for four plugs: about $38–$225, depending on time and rate.
Other factors that can affect the total
- Ignition coils or plug wires: If worn or damaged, replacement may be advised or required, adding $60–$400 or more depending on number of coils and whether you buy aftermarket or OEM parts.
- Diagnostics or misfire checks: Some shops charge a diagnostic fee if a misfire or related issue is suspected, typically $50–$125.
- Engine access and design: V6/V8 engines, turbocharged setups, or coil-on-plug configurations can complicate the job and raise labor time.
- Associated seals or gaskets: In some engines, removing components may require resealing or re-torquing exhaust/intake bits, which adds a little extra time and cost.
Summary
