Check engine light and code P0401

I think the issue we are having is you have replaced parts in the past so you are assuming they are not the issue which makes this very confusing if one of them happens to be the issue.

This means we need to start as if you have not replaced any parts and go through the diagnosis for this code so we can find the cause. It may be one of the parts you have already replaced but that is the only way you will figure it out. Otherwise, you will have to start guessing at replacing parts you already have and that is just a waste of money.

If you feel the fuel filter needs to be replaced, go ahead and do that and it may solve the sluggish feeling but I doubt it would fix the engine light.

Let us know what questions you have. Thanks