Fitment：

• 2002-2004 Infiniti Q45 4.5L
• 2003-2004 Infiniti  M45 4.5L
• 2004 Infiniti   FX45 4.5L

Product Features：

• Condition: 100% Brand New Mass Air Flow Sensor
• Replacement: Directly Plug-in Replacement
• Material: Plastic
• Color: As picture showed
• Warranty: 1 Year
• Note: Our mass air flow sensor is the same with the pic showed in the page

WHAT IS A MAF SENSOR?

A Mass Air Flow sensor is also known as an air meter. It plays a fundamental role in your vehicle. Namely, it measures the amount of air (mass flow of air) entering the internal combustion engine.

Based on these real-time inputs, the engine control unit estimates the amount of fuel mass needed to keep air and fuel in balance. 

Additionally, note that air density changes with the temperature, pressure, humidity, etc. That is where, again, MAF sensors help. When it comes to measuring the intake air quantity in each cylinder, they are more precise than volumetric flow sensors.

How does a MAF sensor work?

Installed in the intake pipe between the air filter housing and the intake manifold, most MAF sensors work on the hot wire principle. Put simply, a MAF has two sensing wires. One is heated by an electrical current, the other is not. As air flows across the heated wire, it cools down. When the temperature difference between the two sensing wires changes, the MAF sensor automatically increases or decreases the current to the heated wire to compensate. The current is then changed to a frequency or a voltage that is sent to the ECU and interpreted as air flow. The quantity of air entering the engine is adjusted accordingly.

Here are a few most common symptoms of a faulty MAF sensor:

• ENGINE STALLING WHEN ACCELERATING

A malfunctioning MAF sensor may result in a variety of driving issues, such as engine stalling, jerking, or hesitating while speeding up. You may experience these problems while accelerating or cruising down the street.

Such engine issues may cause accidents and pose a major safety threat to both you as a driver and other traffic participants. Therefore, if you experience any of them, make sure you have your vehicle examined as soon as possible.

• RUNNING RICH OR LEAN

Both issues indicate that the fuel-air ratio in the engine is not optimal.

Running rich means that there is too much fuel and not enough air. Some of the most common symptoms of a car running rich are decreased fuel efficiency, rough idling, and black smoke coming out of the tailpipe.

Running lean is the opposite of running rich. That means that there is not enough fuel to match the air entering the engine. That indicates that your MAF sensor is sending inaccurate readings to the ECU that, consequently, fails to blend fuel and air at the proper ratio. In the long run, it may seriously harm your vehicle. Running lean for too long may cause hard starting, hard engine seizures, and engine surging.