To access the spark plugs on a 2009 Honda Civic, first, remove the engine cover if your model is equipped with one. Then, locate the ignition coils on top of the engine; each coil is connected to a spark plug. Disconnect the electrical connectors and unbolt the coils to remove them, which will expose the spark plugs for replacement or inspection. Use a spark plug socket and ratchet to carefully unscrew the spark plugs from the engine.
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