Air Filter (FA1902) by Motorcraft®. If you have a dirty air filter, clogged PCV valve, or defective MAF sensor you may be tempted to just run down to the local auto parts chain store for a replacement, but before you waste your time and gas, check out our great selection of air intake system parts. There are lots of stock replacement filters, aftermarket filters, and everything else you need for your air intake system. Best of all.