What would I check? It's a new MAF. My mom took it in a few months ago while I was in Vienna because of a CEL, banks 1+2 lean (P0171 P0174). They changed the MAF and a bunch of other stuff like putting in a Zetec steering rack (stoopid ford dealer, they did fix it after my mom refused a lesson on driving here new Duratec car with Zetec steering). Then the CEL was still on but I think that was related to the cone filter and the IAT hole not having any sealant around it. Since I don't live in the US anymore I haven't had time to fix that but it was fine for 1.5 years. Even the new MAF didn't help. I can't imagine that the filter setup caused this large of a problem.
