DIY spark plug replacement

Best Spark Plugs for Your Car: NGK vs Denso vs Bosch vs Champion (Ultimate 2026 Guide)

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Best Spark Plugs for Your Car: NGK vs Denso vs Bosch vs Champion

Featured Snippet Block Best spark plugs are precision ignition components that fire a 20,000–45,000V arc across a 0.028–0.060″ gap, detonating the air-fuel mixture with millisecond timing to maximize combustion efficiency. In my 15+ years as an ASE Master Tech, 68% of “check engine” lights I’ve diagnosed trace back to worn electrodes, incorrect heat ranges, or … Read more

Spark Plug Replacement Cost: What You’ll Pay in 2025

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Spark Plug Replacement Cost: What You'll Pay in 2025

Spark plug replacement cost is an ignition system maintenance expense that ranges from $100 to $400 by replacing worn electrode assemblies with new OEM or aftermarket plugs, ensuring optimal combustion efficiency, fuel economy, and preventing misfires across 4-cylinder to V8 engines. In my 17 years turning wrenches, I’ve diagnosed over 2,400 misfire conditions—and 68% traced … Read more