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Web check engine light view all » question about 2006 chevrolet cobalt 1 answer my check engine light came on in my 2006 ss cobalt again i had work on it at the dealer the said my mass air flow sensor was contaminated and now two and a half weeks later it came back on what should i do posted by lil_daisee4u on feb 15, 2010 want answer 0 I have had it for around a week now i already checked my gas cap. Scanner does not connect but does power on.