How Often Should the Spark Plugs Be Replaced for the 9th Generation Honda Accord?

[DiSawyer]

9th Generation Accord spark plugs should be replaced every 40,000 kilometers. Steps for replacing spark plugs on the 9th Generation Accord: 1. Remove the spark plug caps when the engine is cold. 2. Unscrew the old spark plugs counterclockwise. 3. Screw in the new spark plugs clockwise. Apply a small amount of engine oil to the threads for smoother installation. Hand-tighten first, then use a wrench to slightly tighten once the threads engage. 4. Reattach the spark plug caps. Note: Do not remove all ignition wires at once; replace one at a time to avoid misconnecting them. 5. After all spark plugs are replaced, verify everything is correct, start the engine, and if it runs normally, the car is ready to drive. Additional Information: Reasons for replacing spark plugs: As the engine runs or the vehicle mileage increases, the required discharge voltage for the spark plug electrode gap continuously rises, approaching the voltage limit provided by the ignition coil. This makes ignition increasingly difficult and eventually leads to misfiring.