Why would 4 spark plugs go bad at the same time?

Asked by Apr 08, 2016 at 03:05 PM about the 2012 MINI Cooper Base Convertible

Question type: Maintenance & Repair

engine light came on car started shaking and chugging.  Dealer is trying to tell
me its 4 bad spark plugs. Seems to me there has to be a root cause of them
going bad all at once.

3 Answers

237,835

Without having the codes, we can't be sure, but if you have a misfire on one cylinder and the plug is bad, you usually replace all of them as they too are probably worn. At $3-$5 a piece, no big deal.

93,045

Could also be bad fuel that caused the problem to begin with and then it all just went down hill from there.

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