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Mazda 6 2014 check engine light

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Mazda 6 2014 check engine light

my brother has a 2014 Mazda 6 and the check engine light comes on for days then it comes off then it comes back again. so I used a cheap scan tool and the codes that come on are P0171, C0301. so I cleaned the MAF sensor with (CRC MAF cleaner) (also used Mitsubishi fuel system cleaner), then the check engine disappeared for a few weeks then it came back on what is the problem? 

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Well you probably need a new math sensor the co is a communication code and that has nothing to do with something being dirty that would mean the circuitry is breaking down that or the wiring or computer itself is getting weak

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