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To change the spark plugs in a 2003 Opel Astra, first, ensure the engine is cool and disconnect the battery. Remove the ignition coil or spark plug leads, then use a spark plug socket to carefully unscrew and remove the old spark plugs. Before installing the new plugs, check and adjust the gap if necessary, then screw them in by hand and tighten with a torque wrench to the manufacturer's specifications. Reattach the ignition coils or leads and reconnect the battery to complete the process.
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