Need to buy a new Kia MAF? Also known as a Mass airflow meter or mass airflow sensor. A MAF could be the cause of an engine light or warning light on your dashboard. A MAF measures the intake of air into your Kia engine so it can calculate how much fuel is needed to efficiently run the engine. If the MAF has failed your engine may run lumpy. Visually it looks like a flow tube which air passes through, the tube has a sensor inside which sends a signal to the Kia ECU.