The Nissan Pathfinder mass air flow sensor is the component in your engine system that regulates the flow of air, as well as its density, in the combustion chamber. It measures how much air is required by your vehicle for it to function at its most optimal. If it is broken, then there would be no control how much air is being put inside the engine, and your car would fail. To prevent this, here are a couple of signs you should watch out for concerning the mass air flow sensor:
One of the very first signs that indicates that your mass air flow sensor is going bad is when you can read the words "Check Engine" written in large friendly letters on the dashboard. The cause of this is very simple: the ratio of air/fuel inside your engine is off by a considerable amount. The best way to confirm the problem is by getting a digital auto diagnosis sensor. This device is available at your local car shop, and it allows the driver to analyze the problems related to your mass air flow sensor, as well as specify what type of issue it currently has.
A less obvious symptom of a problematic mass air flow sensor concerns your engine. If you start to notice that you are getting less bang for your buck in terms of gas mileage, and you are sure that the engine is not at fault, check your mass air flow sensor. At some point in time, dirt and debris could possibly build up around the part. When this happens, it slowly loses its ability to correctly measure airflow around the engine system. Because of this, it will not be able to regulate the ratio between air and fuel, causing various engine troubles. These could come in the form of sub-par car performance, unwanted vehicle shudders, and even occasional stalls. Remove the mass air flow sensor and see if the wires are still clean. Wires covered with debris, grease, or oil are major factors in hindering the car part from getting a good air flow reading.