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Q: why is my 2001mercedes s600 spark plugs foulup every 3000 miles ?check engine on on 2001 Mercedes-Benz S600

for the last 2 years, check engine light on 4 times, each time replacement of all 24 mercedes spark plugs, I only drive in city short distance only 3000 miles each time, what is wrong ? can there be another part problem ?please help Thanks
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Who's clearing the check engine light? Have the code(s) DIAGNOSED when replacing the plugs next time.OR find out what the codes where and post here for a possible solution.
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