How much does spark plug replacement cost?

Typically $150–$400 at a US independent shop — about $30–$120 in parts and $100–$300 in labor for a mainstream vehicle. Your exact cost depends on your year, make, model, and engine. The free AI Mechanic gives a vehicle-specific estimate.

What makes spark plugs replacement cheaper or more expensive?

4-cyl (easy) vs V6/V8 (some require intake removal); Iridium/platinum plugs cost more but last 100k mi; Coil-on-plug boots often inspected/replaced.

Spark plug replacement cost

A spark plugs replacement typically costs $150–$400 at a US independent shop for a mainstream vehicle — but your exact cost depends on your year, make, model, and engine.

Parts: $30–$120
Labor: $100–$300
Total: $150–$400

Fresh plugs fix many misfires, rough idle, and lost fuel economy. The parts are cheap; cost is driven by how hard the plugs are to reach.

What affects the price

4-cyl (easy) vs V6/V8 (some require intake removal)
Iridium/platinum plugs cost more but last 100k mi
Coil-on-plug boots often inspected/replaced

DIY vs. shop

Easy-to-intermediate DIY on most 4-cylinders, saving $100–300.

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Ranges like this are a starting point. Tell the AI Mechanic your year, make, model, and the symptom or OBD2 code — it estimates the cost for your exact vehicle, flags the likely cheap fix before the expensive one, and tells you when a shop is genuinely the right call.

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Related codes: P0300 , P0301

Related symptoms: Rough or unstable idle , Engine misfire

More repair costs

catalytic converter $900–$2,500 alternator $400–$900 brake pads $150–$350 brake rotors $300–$600 timing belt $500–$1,000 oxygen sensor $150–$350