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How to Replace Mass Airflow Sensor 01-05 BMW 325Xi

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How to Replace Mass Airflow Sensor 01-05 BMW 325Xi

Created on: 2021-01-16

Watch this video to learn how to replace the mass airflow sensor (MAF) on your 01-05 BMW 325 Xi or similar 3 Series BMW. 1A Auto shows you how!

  1. step 1 :Removing the Mass Airflow Sensor
    • Disconnect the MAF electrical connector
    • Loosen the worm clamp securing the intake elbow to the MAF
    • Slide the intake elbow off the MAF
    • Release the mounting clip on each side of the MAF
    • Remove the MAF from the air box
  2. step 2 :Installing the Mass Airflow Sensor
    • Take note of the arrow on the MAF indicating airflow direction
    • Check the rubber O ring on the air box and replace it if necessary
    • Insert the MAF into the air box
    • Secure the MAF with the mounting clip on each side
    • Reinstall the intake elbow onto the MAF
    • Tighten the worm clamp on the intake elbow
    • Reconnect the MAF electrical connector

Tools needed for replacement

  • Screwdrivers & Related

    Flat Blade Screwdriver

Installation Video
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What's up guys? I'm Andy from 1A Auto. In this video, I'm going to show you how to replace the mass air flow sensor on this 2001 BMW 325xi. If you need this part or other parts for your vehicle, click the link in the description and head over to

I'm going to disconnect this connector right here on the top of the mass air flow sensor and just push down. Pull that connector off. Take a straight blade screwdriver, loosen up this worm clamp. We can slide this boot off. Slide it back. There's some clips over here. There's a clip on this side. Pop that off, and then one on this side. You can use the screwdriver or you can just try to use your fingers and pull that off, and we can slide this out.

Just like that. Here's the old mass air flow sensor. Here's the new mass air flow sensor from As you can see, the shape is the same, connector is the same. It's the same on the back. It's the same diameter. Get yours at, and you can do it yourself.

When we go to install the mass air flow sensor, there is an arrow directing which way the air flow goes. So the air flow comes in through the air box, goes through the mass air flow sensor, and into the engine, into the intake manifold.

We're going to slide this in this way. There is an O-ring on the inside of the air box right there, so make sure that O-ring is positioned right. This O-ring is all mangled up, so keep in mind it's a good idea to replace that O-ring if it's messed up.

So we'll just slide this in position. With that pushed all the way in, we can then clip it on, push those clips on. If you struggle with getting this on, you could pull the whole air box off. There's just four clips that clip that on, and then that snorkel has to be pulled off.

All right. Now we're going to reinstall this intake tube and the worm clamp. Slide that in position. Get this lined up first. Just like that, line it up. Take a straight blade screwdriver. Tighten this down. There we go. Just tighten that up. Take the connector, line it up. Plug it in.

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Tools needed for replacement:

    Screwdrivers & Related

  • Flat Blade Screwdriver

1999 - 2000  BMW  528i
1999 - 2000  BMW  Z3
1999 - 2002  BMW  Z3
2000 - 2000  Volvo  V40
1999 - 2000  Hyundai  Sonata
2002 - 2005  Land Rover  Freelander
2004 - 2006  Suzuki  Verona
2000 - 2000  Volvo  S40
1999 - 2000  BMW  323i
2001 - 2002  BMW  325Ci
2001 - 2003  BMW  525i
2000 - 2000  BMW  328Ci
1999 - 2000  BMW  328i
2002 - 2002  BMW  325i
2001 - 2005  BMW  325Xi
2003 - 2003  BMW  325Ci
2001 - 2001  BMW  325i
2000 - 2000  BMW  323Ci

99-03 BMW 3, 5 Series; 99-00 Sonata 2.5L; 02-05 Freelander; 04-06 Epica, Verona; 00 V40 S40 Air Flow

Mass Air Flow Sensor DIY Solutions EMS00023

Part Details:

  • Direct Fit Replacement - Guaranteed to fit and function for your specific application
  • Quality Tested - built to a strict level of product standards.
  • Includes Housing
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