Question about 2001 Mercury Sable

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Mercury sable 2002 check engine keping coming back P0401 !

What should i do , i already clear those codes up to 3 times witrh in the past 6 moths and it continue to coming back, now i have to smog my car with 3 weeks, what should i do ?
Thank you in advance.

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How did you clear those codes ?

Posted on Aug 13, 2008

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Digram of firing order for spark plugs, for 1991 mercury sable


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