Cost Guide
Spark plug replacement
Engine misfire — rough, lumpy idle or hesitation when accelerating. Price varies by make, model and region — select your car below for an accurate estimate.
See pricing for your car
Parts, labour and total cost for your exact make and model.
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Common symptoms
- Engine misfire — rough, lumpy idle or hesitation when accelerating
- Check engine light, often with misfire codes P0300–P0308
- Noticeably worse fuel economy
- Difficulty starting the engine, especially when cold
- Engine surging or running roughly at steady speed
What affects the price
- Copper vs iridium vs platinum plugs (iridium lasts longest)
- Number of cylinders
- Accessibility—some engines require intake manifold removal, adding significant labour