P-1283 Non-standard Code?

my infiniti give me that code like one month ago, i try to find out with motoralldata database, but the code doesn't exist on the database, so i erase, today has return but i don't have idea of what is going on with. i search with other vehicle for example the qx56 and that code refer to the A/F sensor, but i'm not sure if correspond to my SUV.


any idea guys?
 
might be throwing an AF code since you installed the headers and if i remember correctly werent you having some problem with the header install?
 
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