This mass air flow sensor is just what you need to get your vehicle in good working order again!


  • Brand New Mass Airflow Sensor
    • Not remanufactured
    • No core charge
  • Replaces dealer part numbers: 3L3Z-12B579-BA, 3W7Z12B579BA
  • Fits in between air cleaner and air intake hose
  • Is 100% computer tested prior to leaving manufacturer

Installation Notes:

1. Make sure the air filter is in good condition and replace if necessary.
2. Clean out and inspect the intake hose when replacing this part. Moving the intake hose during replacement can loosen dirt which can then damage the new sensor.

This item is an electrical part. These units are tested prior to shipment.

Returns Note:

Our electrical and electronic parts are subject to strict quality control testing.  Once the item has been installed or plugged in, it is no longer eligible for a refund.  The item may be eligible for replacement, only if it is found to have a manufacturing defect. Before purchasing, please ensure proper diagnosis of the failed original part is performed.

Note:  You may be required to reset the vehicle’s computer after installation of this part.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Removing the Air Intake Box (0:30)
    • Disconnect the mass air flow sensor wiring harness
    • Open the air box clips
    • Loosen the air intake hose clamps with a flat blade screwdriver
    • Open the air intake box
    • Remove the air intake box from the hose
  2. step : Removing the Mass Air Flow Sensor (1:04)
    • Remove the four 10mm bolts on the Mass Air Flow Sensor
    • Insert the new mass air flow sensor
    • Insert and tighten the four 10mm bolts
  3. step : Installing Air Intake Box (1:38)
    • Connect the air intake hose to the air intake box
    • Insert the air intake box into its slots and connect the clamps
    • Tighten the air intake hose clamp with a flat blade screwdriver
    • Connect the mass air flow sensor wiring harness

Tools needed for replacement:

    Ratchets & Related

  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket

3.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Did Not Fit
The 4 bolt pattern was way too large to fit my OEM 2003 Lincoln TC. I guess I have to eat my loss - with no hope of a refund.
July 7, 2018
2 months ago
Response from 1A Auto
Thank you for your recent purchase with 1A Auto. We are sorry to hear there was an issue with the item received. One of our customer service representatives will be reaching out to you for a resolution. Thank you.
July 7, 2018
Jessica D
It was easy to order, the price was great and it works like a charm. I have recommended this website to all my friends.
June 13, 2018
3 months ago
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Vehicle Fit

Year Make Model Description
2003-2004Ford Crown Victoria Ford Crown Victoria Air Flow Meter Sensor (excluding Police Package)
2003-2004Lincoln Town Car Lincoln Town Car Air Flow Meter Sensor
2003-2004Mercury Grand Marquis Mercury Grand Marquis Air Flow Meter Sensor

This part replaces:

  • Hollander 336-05236
  • OE # 3W7Z12B579BA
Part #: 1AEAF00081

Out of Stock

How-to Video:

(02:33 min)