The most common cause of a malfunctioning MAF sensor in Jeep Wrangler is dirt and grime accumulation on the sensor. What causes MAF sensor to fail in Wrangler? Dirt accumulation This can cause the engine warning light to illuminate in the instrument cluster and the fault can be read out by a diagnostic device. The engine runs too “lean” or too “rich”.

The optimal amount of fuel can no longer be calculated which results in either too little or too much fuel injected into the combustion chambers. If the MAF sensor is defective or dirty, it does not send correct measured values to the control unit of Wrangler. What happens when MAF sensor malfunctions in Jeep Wrangler? It is not only important for power delivery in your Wrangler, but also for the lowest possible pollutant emissions. Good Luck.The mass air flow sensor is part of the engine’s intake system and is located between the air filter and the throttle body. When you start trying to make more power on your engine, the same long road of doing one thing that leads to another thing will begin. When you add big tires to your truck, you then have to lift the truck, then you have to make suspension improvements and so forth till it is right for you. You start down a long road when you make adjustments to you stock Taco. When you go beyond the stock computer's ability to make power and economy and environmentally clean conditions, you will get service codes and poor performance.

A lot of information is fixed inside the computer and it reacts to the information the sensors provide. The factory spent a long period of time trying to make the computer work in all environments. The stock computer for the engine is a simple device with complex computations inside it. If you add more spark advance without adding fuel or air you will lean out your mixture and wear out your engine prematurely. If you add more fuel without adding more air, you will have a rich mixture and you will make less power and wash away your oil on your cylinder walls. If you change just one part of the balance, like adding more air with no increase in fuel to compensate for the additional air, you will lean your air/fuel mixture and make less power and increase engine temps. The stock computer has maps inside that are for air, fuel, and spark.

Jet mass air flow sensor problems