An air flow meter insert contains the sensor unit which measures the flow rate of air entering the engine, allowing the ECU to inject the optimal amount of fuel into the cylinders. When the air flow meter wears out, your engine is no longer performing optimally which leads to problems such as excess fuel consumption, stalling and increased exhaust smoke production. Replacing a faulty air flow meter with the Genuine OEM Parts Air Flow Meter Insert AM26010N is a simple fix that will bring your engine performance levels back to normal.