Spark Plug Replacement Cost

What owners actually paid

What this repair is

Spark plugs ignite the fuel in each cylinder. Worn plugs cause rough running, misfires, poor fuel economy, and eventually a flashing check-engine light. Modern plugs last 60k–100k miles; the price is mostly labor, which varies hugely by how buried the plugs are on your engine.

Spark Plug Replacement cost by vehicle

The most-repaired vehicles first. Each range is the middle half of real invoices for that vehicle; vehicles with their own page carry the full breakdown, real repair reports and a printable Fair Price Report.

Middle half of real invoices (25th–75th percentile) for that make and model, parts + labor.

What moves the price

• Cylinder count — eight plugs cost twice four — in parts and time.
• Access — rear-bank plugs on transverse V6 engines can mean intake removal.
• Plug type — iridium and platinum plugs cost more but last far longer.

Quotes near the low end usually mean four plugs on top of a four-cylinder. Quotes near the high end usually mean iridium plugs on a V6 or V8, rear bank under the intake, coil boots replaced.

The complaints behind this repair

Owners who end up with this repair most often came in with: Car Running Rough or Misfiring · Check Engine Light On · Car Cranks But Won't Start · Car Stalls or Dies While Driving. Each of those pages shows how often the complaint actually ends in this fix, and what the alternatives cost.

Not sure what's wrong yet?

Start from what the car is doing. The FixDozer drill asks a few plain questions and shows which fixes that complaint usually turns out to be — with the real cost of each.