Why would 4 spark plugs go bad at the same time?
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.
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.
Could also be bad fuel that caused the problem to begin with and then it all just went down hill from there.
How many miles on your Mini?
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