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How to check and replace the ignition coils & spark plugs. My step by step video is here: All my other how to guides are here: https://www.youtube.com/c/roadandracetv http://road-and-race.co.uk An ignition coil is an induction coil that transform the low voltage from the battery to the high voltage needed for the spark plugs. On the Boxster these are exposed to the elements so it’s prudent to check them for hairline cracks. As it’s very little additional effort and because spark plugs are cheap I’ll replace all six whilst I’m there. Car used