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How does a MAF sensor work?
The Importance of Yezoauto Air Flow Meters
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.
When a MAF sensor fails, the engine will not know the right amount of fuel to add, causing several common signs:
- Check engine light
- Engine runs rich at idle or lean under load
- Engine runs rich or lean: caused by the MAF
- Rough idle or stalls
- Excessive vibrations when stationary
- RPMs changing noticeably without driver input
How to install mass air flow sensor
Step1
When replacing a mass air flow sensor, first locate the sensor which is positioned in the air intake tube between the air filter housing and throttle body
Step2
Release the safety clip and gently pull the connector from the sensor
Step3
A clamp is used to attach the sensor to the air intake tube, use a screwdriver or small socket and loosen the clamp
Step4
Next, undo the inlet clip on both sides. There are many methods of holding the MAF in place, the principle is the same
Step5
Once all mounting clips or bolts have been undone, lift the sensor and remove it from the engine bay
Step6
After the sensor has been removed, inspect internal parts and electrical connector for damage
Step7
Compare the old sensor to the replacement unit, they should match identically, remove dust caps before installation
Step8
Gently reinstall the sensor into the inlet and outlet tubes, ensuring a proper seal between the sensor and the tube
Step9
After connecting the sensor to both inlet and outlet tubes, tighten the clamp and attach the clips
Step10
Reattach the sensor electrical connector ensuring a small click, when completely connected
Step11
Once the sensor has been replaced, attach a code reader to the ALDL connector
Step12
Turn the ignition key to the "ON" position and follow the prompts to clear any codes in the system
Fitment:
Fits the Following Vehicles：
2002 BMW 325 325i E46 2.5L from Aug 2002
2003 BMW 325Ci Models with M54 Engine ID From Production Date 03/03
Fits the Following Vehicles：
2004-2005 BMW 325I Models with M54 Engine ID
2003-2006 BMW 325 325Ci
Fits the Following Vehicles：
2004-2006 BMW X3 2.5L/3.0L Engine
2003-2005 BMW Z4 Z4 2.5L/3.0L Model
Why Choose Yezoauto?
Rigorous testing
Mass air flow sensor are sealed with adhesive to prevent dust and contaminants from contacting the circuit boards, and each product is rigorously inspected prior to shipment to extend the life of the mass air flow sensor.
Accurate reading
The Mass Air Flow Meter MAF sensor measures the volume and density of air entering the engine, providing the ECU with highly accurate air flow readings over a wide range of ambient temperatures.
After-sales service
We are committed to creating a better shopping experience for our customers. If you encounter any problems with the product during use, please leave us a message and we will reply within 18 hours to provide you with the solution you want.
Latanya Artwell
Reviewed in the United States on March 20, 2025
I purchased this item for my boyfriend, it’s very affordable, it’s functional, and the quality is great
Cherelle Greene
Reviewed in the United States on February 20, 2025
I really don't like items from China for my car. It's not going to last long
Sheldon Prinsloo
Reviewed in the United States on February 2, 2025
The listing stated this would fit a 2.5 L and 3.0 L X3, but this only fits a 2.5 L engine. If you have a 3.0 L engine you need BMW 13627513956. There is a listing by the seller for the bigger sensor. See photos for difference.
aaron carpenter
Reviewed in the United States on January 16, 2025
Car was backfiring running very lean. Old air mass meter was causing this. Plugged this in immediately noticed adaptations correcting and no more backfiring. I'm happy. Master Elite BMW Technician my personal vehicle. So far it's been on over a week driving daily no faults at all.
A. Sanchez
Reviewed in the United States on September 20, 2024
So far so good it helped clear a code. It is super easy to instal, there is only one way to install just check your connection some cars have different plugs. Good quality plastics, only time will tell
shauna johnson
Reviewed in the United States on October 9, 2024
I couldn't use this item it didn't fit my vehicle. I'm in Virginia and I will be turning it at whole foods in Newport News Virginia.
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