Question about 2008 Mini Cooper S

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4th cylinder misfiring

My Check Engine light came on, so I went by an auto store and asked if they could use one of those small devices to read the error code. They did and told me that the 4th Cylinder is misfiring. They said it could anything from a dirty spark plug to some carbon buildup. I can check the spark plug myself, but isn't there some additive I can use to add to gasoline to do some cleanup? Thanks.

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Here's a link to your code. P0304 Code Cylinder 4 Misfire

Posted on May 18, 2014

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