MAF sensors have a tremendous tendency to get dirty and cause several headaches that may include: bad gas mileage, higher emissions, and/or lack of power. A tremendous lack of power upon acceleration.MAF sensor malfunction that DOES NOT light up the check engine light (CEL).P0103: Mass Air Flow (MAF) Circuit High Input.P0102: Mass Air Flow (MAF) Circuit Low Input.MAF Codes that light up the check engine light (CEL) on your instrument cluster.This list covers the majority of symptoms I've seen on these types of Ford mass air flow sensors: You can find this tutorial in Spanish here: Cómo Probar El MAF Ford (4.2L, 4.6L, 5.4L) (at: ). OK, one last thing before we jump into the test, if you're diagnosing a 4.6L or 5.4L pick up or SUV, let me just make you aware where you can find a complete list of 4.6L and 5.4L 'How To Test' articles that are located in this Web Site and at and this list is found here: Ford 4.6L, 5.4L Index Of Articles.

If you're looking for the article on how to test the Ford MAF sensor that's not inside the air filter canister assembly, go here: How To Test Ford MAF Sensors Using A Multimeter. You don't even need a scan tool! Below you'll find important pre-test info that'll speed up the diagnostic process. The MAF sensor test/diagnostic can be accomplished in four easy steps using a multimeter. As you may already know, the MAF sensor is inside the round air filter canister assembly and this article will teach you how to test it. This article will walk you through the whole process without removing the MAF sensor from the engine.

Testing the MAF ( Mass Air Flow) sensor on your Ford truck or SUV or full size van is a very simple and easy affair.

F150 mass air flow sensor problems