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Coil packs - preventative maintenance

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Neb10:
Hi, looking at doing a full service on my car. Considering replacing coilpacks at the same time with Bosch or genuine ones. I have no history of them previously being replaced. Am I likley to see any improvement in replacing them or would I be better off replacing them when/if they fail.

Thanks

GVK:
If you have no misfires seems a shame replacing them, but if you do get a misfire it's best to replace all four.

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