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They should be replaced at around 100,000 miles. The cam belt on your 2003 Honda must be replaced at 110,000 miles. As long as the engine is running fine I would replace the spark plugs at the same time. Also replace the water pump at this time. This is an interference engine, and as such if the belt breaks you will have serious engine damage.

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Q: When should spark plugs be changed on a 2003 Honda Accord Sedan 6 cylinder?
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