Spark plug is an essential part of any working combustion engine and all modern cars. Like anything, they wear out after long time using. And they are a relatively easy-to-fix issue on your car. If you hire someone to replace it, it will cost a lot and so not profitable. Because is so easy to do it, so i share this guide on how to replace spark plug correctly by yourself.
Tools you need:
1.Ratchet
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