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Truck is running great service light came on p1278 code air fuel ratio 1 is there anything I can do to fix this or what kinda costs am I looking at any help is greatly apprieciated.
 

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I had the same codes , air fuel sensor, both banks. Cleared the codes, two tanks of gas later, ses has not reappeared. Truck ran perfect before and after. This was my first ses , in 7 yrs. Any advice from the more knowledable would be appreciated.
 
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