Hey guys so recently as of yesterday my CEL came on in my 2016 3 at 31,000. I checked the code and it was P0171 running too lean. I checked to see what the possible causes were and from what I've read there's a lot, MAF, MAP, PCV, fuel injectors, ect. So just to narrow down my search. What componets cause this issue that I should look at first? Thanks!