Spark plug replacement cost
Routine maintenance that also shows up when diagnosing misfires (P0300 / P0301).
Typical U.S. independent-shop price range
$288–$399 national average for spark plug replacement.
- Labor: $184–$270
- Parts: $104–$129
- Source: RepairPal — price data as of September 3, 2026. Excludes taxes, fees, diagnostic time, and your location. Related repairs may be needed.
What’s usually included
National average covers plugs and labor for a full set. Coil-on-plug designs add time; some V6/V8 banks need intake removal. Coils are separate — see ignition-coil ranges on P0300 when relevant.
Dealer vs independent
Dealers use OEM plugs at OEM intervals. Independents can install the same OEM plugs — ask for the part number (e.g., iridium) on the estimate.
Common upsell red flags
- Full coil set “while we’re in there” without misfire history or test results
- Fuel-system flushes bundled without a complaint
More patterns: spotting upselling.
Questions before you authorize
- How many plugs, and what brand/heat range?
- Are any coils being replaced — why?
- Is intake removal required on my engine?
Also see before you authorize a repair and how to read a repair estimate.
DIY vs shop
Common DIY on accessible fours; easy to cross-thread or break porcelain. Torque matters. See DIY vs shop.
Confirm the code before you authorize (disclosed)
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For sensor and emissions jobs, a reusable Bluetooth OBD-II scanner helps you capture codes and live data before paying for “mystery” diagnostics. One option: BlueDriver Bluetooth Pro OBD-II scan tool (BlueDriver/Levanta affiliate). Any capable OBD-II reader is fine — this is not required to use Fair Auto Shops.
Optional tools (disclosed)
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- EPAuto 40-piece socket set — Basic sockets for accessible coil-on-plug or plug jobs — only if you are comfortable with DIY torque.
- Mechanix Wear Original work gloves (Medium) — Keep hands intact when handling oily plugs and coil boots. Pick your size on Amazon if Medium isn’t right.
FAQ
How much does spark plug replacement cost?
According to RepairPal, the U.S. figure is $288–$399 for spark plug replacement (price data as of September 3, 2026), excluding taxes, fees, and location. Your vehicle and region will differ.
Why is a shop quoting more (or less) than the national average?
Labor rates, OEM vs aftermarket parts, vehicle packaging, diagnostics, and related repairs move the number. National averages on this page exclude taxes, shop fees, diagnostic time, and your location. Ask for a line-item estimate and compare with a second independent shop.
What’s usually included — and what’s excluded?
National average covers plugs and labor for a full set. Coil-on-plug designs add time; some V6/V8 banks need intake removal. Coils are separate — see ignition-coil ranges on P0300 when relevant. Cited ranges exclude sales tax, shop fees, diagnostic time, and regional labor-rate differences unless a source on this page says otherwise.
Can I DIY this, or should I use a shop?
DIY-able rating on this guide: Maybe. Common DIY on accessible fours; easy to cross-thread or break porcelain. Torque matters. See DIY vs shop.
Does this page tell me if it’s safe to keep driving?
No. Cost ranges are not a drivability diagnosis. Confirm symptoms with a shop; use the questions on this page before you authorize related work.
What upsell red flags should I watch for on this job?
This guide flags: Full coil set “while we’re in there” without misfire history or test results; Fuel-system flushes bundled without a complaint. More patterns: /upselling.
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