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In the next section, I'll go into some of the specific symptoms you'll see when the MAF sensor fails.

As a result, and as mentioned earlier, engine performance suffers. Without this information, the fuel injection computer lights up to check engine light with a mass air flow sensor trouble code. When the mass air flow sensor fails, it stops measuring and reporting the amount of air entering the engine to the fuel injection computer. With this air intake information (the MAF sensor reports), the fuel injection computer can now calculate the correct amount of fuel to inject into the cylinders and fine-tune other engine management operations that ensure the engine runs optimally and efficiently. To be more specific, the mass airflow sensor's output signal increases as the engine RPM increase.Īs engine RPM decrease and less air passes through the sensor's assembly, its output signal decreases. It then reports this measurement to your 4.0L Ford Explorer or Mercury Mountaineer's fuel injection computer. The mass air flow (MAF) sensor's job is to measure the amount of air passing through its assembly. More Ford 4.0L Explorer (Mercury Mountaineer) Tutorials.ĪPPLIES TO: This tutorial applies to the following vehicles:.Can I Drive My Explorer (Mountaineer) With A Bad MAF Sensor?.How Can I Find Out If The MAF Sensor Is Bad?.