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Check engine light will not shut off

I bought my F150 ecoboost almost 3 years ago. When I bought it it had the check engine light come on almost immediately. So we put it on a diagnostic code reader it said something about the #2 cylinder running lean. So we purchased all new coil packs for the truck, installed them. It ran great for about 4 months, then the light came back on, still reading the same code but this time the engine would sputtering when accelerating to pass another vehicle on the road, and when it shutters the engine light flashes until it smoothens back out. What am I missing?

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It might be your scanner - cheaper scanners can sometimes give you trouble clearing permanent codes even once fixed. You probably need a better scan tool. I use the Innova 5610 or Xtool (limited bidirectional, it was added to my pre upgraded IP616) and Vdiagtool which has full bidirectional support which I got because it was on my short list and on sale. You want one with eOBD OEM codes.

This still kind of works but on ~2015 and up, not as much for emissions codes and such (even borderline P codes) due to the EPA but sometimes the pull the battery for 30 minutes trick still works for "active" and "history" codes.

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Mikayla Nelson will be eternally grateful.