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Mass Air Flow Sensor Replacement
 
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Pelican Technical Article:

Mass Air Flow Sensor Replacement

Nick Czerula

Time:

1 hour1 hr

Tab:

$200 to $300

Talent:

**

Tools:

Flathead screwdriver, 10mm socket and ratchet

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

Mass airflow sensor

Hot Tip:

Work with a cool engine. Clear engine fault codes when done

Performance Gain:

Car will run well.

Complementary Modification:

Replace engine air filter, inspect intake air ducts for cracks or dry rot.

The mass airflow sensor monitors air flow into the engine and creates a digital signal for the DME. Mass airflow sensors accuracy skews over time and can lead to fault codes or drivability problems. When replacing inspect the rubber intake air ducts for cracks or dry rot. If intake air ducts are faulty, replace them first and see if the problem you are having is remedied. An un-metered air leak downstream of the mass airflow sensor will set codes similar to a faulty mass air flow sensor.

Models with 4-cylinder engine:

Using a flathead screwdriver, loosen the secondary air pump inlet hose clamp.
Figure 1

Using a flathead screwdriver, loosen the secondary air pump inlet hose clamp. (green arrow)

Then remove the secondary air inlet hose from the air filter housing by pulling it straight off.
Figure 2

Then remove the secondary air inlet hose from the air filter housing by pulling it straight off. (green arrow)

Next, you will unclip the three air filter housing retaining clips.
Figure 3

Next, you will unclip the three air filter housing retaining clips. (green arrows). One of the clips was hidden beneath the secondary air inlet hose. You will have to reach in behind air filter housing to access it.

Disconnect the intake air sensor electrical connector by pressing the wire release tab and pulling the connector straight off.
Figure 4

Disconnect the intake air sensor electrical connector by pressing the wire release tab and pulling the connector straight off.

Working at the air flow meter, twist electrical connector counterclockwise to disconnect.
Figure 5

Working at the air flow meter, twist electrical connector counterclockwise to disconnect. (green arrow). Then loosen the air flow meter hose clamp (yellow arrow).

Once loose, lift and remove the air filter housing lid from the engine compartment.
Figure 6

Once loose, lift and remove the air filter housing lid from the engine compartment.

Place air filter housing lid on solid surface.
Figure 7

Place air filter housing lid on solid surface. Then unclip the two spring clips (green arrows) that hold the mass air flow sensor into the air filter housing lid.

Pull mass airflow sensor straight out of the air filter housing.
Figure 8

Pull mass airflow sensor straight out of the air filter housing. Install new mass airflow sensor into air filter housing. If O-ring gives you a hard time going in, apply a small amount of dish soap to O-ring, it will slide right in and the soap will not damage O-ring. Install air filter housing into vehicle in reverse order of removal. Take vehicle for a test drive, then recheck your intake air duct connections.

Models with 6-cylinder engine:
Working in the engine compartment, loosen air flow meter clamp (green arrow), then disconnect the air duct from air flow meter by pulling straight off air flow meter.
Figure 9

Working in the engine compartment, loosen air flow meter clamp (green arrow), then disconnect the air duct from air flow meter by pulling straight off air flow meter. Next, disconnect air flow meter electrical connector by pressing wire clip (purple arrow) and pulling it straight off. Then unclip the two spring clips (green arrows) that hold the mass air flow sensor into the air filter housing lid.

Pull mass airflow sensor straight out of the air filter housing.
Figure 10

Pull mass airflow sensor straight out of the air filter housing.

Install new mass airflow sensor into air filter housing.
Figure 11

Install new mass airflow sensor into air filter housing. If O-ring (green arrow) gives you a hard time going in, apply a small amount of dish soap to O-ring, it will slide right in and the soap will not damage O-ring. Install air filter housing into vehicle in reverse order of removal. Take vehicle for a test drive, then recheck your intake air duct connections.

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Page last updated: Fri 12/9/2016 02:07:05 AM