The ST supplemental manual for my '16 lists an incorrect part number for the air filter- FA-1908.
This is actually a round air filter for a Focus.
The correct part number is FA-1914. Our air filter has a trapezoidal shape as most of you know. I checked the '19 ST manual online and it has the correct part number listed, I'm not sure about other years.
These are Motorcraft part numbers, just to make it even more confusing there is also a Ford part number, the correct one is CN1Z-9601-A.
This link to Tasca Parts shows the correct Ford part number, the picture in it shows the correct Motorcraft part number-
https://www.tascaparts.com/oem-part...vPWZpZXN0YSZ5PTIwMTYmdD1zdCZlPTEtNmwtbDQtZ2Fz
Here is the picture of the correct air filter-
This is actually a round air filter for a Focus.
The correct part number is FA-1914. Our air filter has a trapezoidal shape as most of you know. I checked the '19 ST manual online and it has the correct part number listed, I'm not sure about other years.
These are Motorcraft part numbers, just to make it even more confusing there is also a Ford part number, the correct one is CN1Z-9601-A.
This link to Tasca Parts shows the correct Ford part number, the picture in it shows the correct Motorcraft part number-
https://www.tascaparts.com/oem-part...vPWZpZXN0YSZ5PTIwMTYmdD1zdCZlPTEtNmwtbDQtZ2Fz
Here is the picture of the correct air filter-
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