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Q: CHECK ENGINE LIGHT ON on 2001 Honda Accord

MY HONDA ACCORD 2001 EX V6, MY CHECK ENGINE LIGHT ON. WHEN I GO FOR DIAGNOSTIC.
THERE ARE P0300, P0301, P0302, P0304, P1399.

is changing spark plugs will help.

Please suggest me what to do.

thank you
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Read this, it will help explain why these codes are appearing: http://repairpal.com/OBD-Code-P0300. I would lean more towards the cap and rotor, and might as well replace the wires and plugs if any of them have over 30,000 miles on them.
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