Standard Ignition MAS0259 mass air flow sensor for the 2003-2006 BMW 325Ci 6-cylinder 2.5L and other vehicles measures the air entering the engine and sends the reading to the ECU. The ECU uses that reading to deliver the correct air/fuel ratio for clean burns.
A rough idle, hesitation or poor fuel economy can mean the sensor is worn, though a leak in the intake ducting or a clogged air filter can sit behind the same symptoms, so find the cause before you replace it.
It is listed for a wide range of BMW models, including the 2004-2006 BMW X3 6-cylinder 3.0L and the 2003-2005 BMW 325i 6-cylinder 2.5L, and each car takes one sensor. It is a direct-fit OE replacement for these cars. Open the "Vehicles it fits" section to check your exact model and engine.
Fit and size
Build and materials
One mass air flow sensor with its housing.
Is this the right mass air flow sensor for a 2003-2005 BMW 325i 6-cylinder 2.5L?
Yes. Standard Ignition MAS0259 is listed for the 2003-2005 BMW 325i 6-cylinder 2.5L, and that car takes one sensor.
Is this a BMW X3 mass air flow sensor for the 2004-2006 model with the 6-cylinder 3.0L?
Yes. The 2004-2006 BMW X3 6-cylinder 3.0L is in the fitment for Standard Ignition MAS0259, and it takes one sensor.
What connector does the Standard Ignition MAS0259 have?
It has one oval female connector with six male blade terminals. The sensor attaches with a snap fit and has two bolt holes.
How can I tell if a mass air flow sensor is going bad?
A check engine light or stalling can be signs. With the engine off and cool, look for a cracked housing or a damaged connector; a shop can scan the airflow reading.
Does this Standard Ignition mass air flow sensor come with its housing?
Yes. The MAS0259 is a complete assembly with the housing included.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
