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To replace the spark plugs yourself, you will need a key with a delicated head on 16 with a magnet. First we need to disconnect the ignition coils, then turn off the candles. It may be necessary to make an effort. The key is not recommended to move ropes, you need to pull hard, but smoothly, otherwise the candle might break.
It is necessary to keep the new candles around neatly, to ensure that there is no distortion. It could damage engine threads, which would entail costly repairs.