If you have a rough running engine or one of these other symptoms of a bad MAF sensor shown in this video, follow these steps to inspect the mass air flow sensor.
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How to Test a MAF Sensor
The mass air flow (MAF) sensor reads the air flow entering the engine. A defective MAF sensor can cause engine stalling, a rough running engine, and a check engine light for trouble codes like code P0171. Find out how to test a MAF sensor and how to replace a defective one with these tips from our mechanics.