Mass Airflow Sensors (MAF) and Air Flow Meters

Shop OEM replacement mass airflow sensors and air flow meters for Toyota, Holden, Ford, Mitsubishi, Nissan, Hyundai, Kia, BMW, Mazda and more. Matched to OEM specifications for accurate air measurement. Use the Vehicle Part Finder to confirm fitment.

Shop Our Mass Airflow Sensors (MAF) and Air Flow Meters

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What Does a Mass Airflow Sensor Do?

The mass airflow sensor (MAF sensor or air flow meter) measures the volume and density of air entering the engine and sends this data to the engine control unit (ECU). The ECU uses this information to calculate the correct amount of fuel to inject for efficient combustion. Without accurate airflow data, the ECU cannot maintain the correct air-fuel ratio - resulting in an engine that runs too rich or too lean. There are two common MAF sensor types: hot wire sensors (the most common in modern vehicles) and vane-type air flow meters found in older Japanese models.

Symptoms of a Failing MAF Sensor

A faulty or contaminated MAF sensor sends incorrect data to the ECU, causing a range of drivability problems. Common symptoms include:

  • Poor or deteriorating fuel economy
  • Rough or unstable idle
  • Hesitation or stumbling under acceleration
  • Engine surging or hunting at constant speed
  • Stalling at idle or shortly after starting
  • Black smoke from the exhaust (running rich)
  • Check Engine light with codes P0100 to P0104

MAF sensors can also suffer from contamination rather than outright failure - a dirty sensor from a poorly fitted aftermarket air filter can cause the same symptoms as a failed unit. Always check for contamination before replacing the sensor.

Fitment and Technical Accuracy

MAF sensors vary significantly between vehicles. Sensor type, housing diameter, connector configuration, and output signal type (frequency or voltage) all differ between makes and models. Fitting an incorrect sensor will produce inaccurate air readings and can cause the engine to run dangerously lean. Every sensor in our range is cross-referenced against OEM part numbers for an exact match. Use the Vehicle Part Finder or filter by make and model to confirm fitment before ordering.

Why Buy From SensorGal?

SensorGal is a 100% Australian owned family business stocking aftermarket OEM replacement mass airflow sensors and air flow meters for Toyota, Holden, Ford, Mitsubishi, Nissan, Hyundai, Kia, BMW, Mazda, Subaru, Mercedes-Benz and Suzuki. With 82 sensors in stock covering a wide range of makes and models, we have one of the largest MAF sensor ranges available in Australia. Orders placed before 12 noon are dispatched same day from our Cranbourne VIC warehouse. All parts carry a 1-Year Australian warranty and our no-fuss returns policy.

Frequently Asked Questions

Can I clean my MAF sensor instead of replacing it?

Yes - if the sensor is contaminated rather than electrically failed, cleaning with a dedicated MAF sensor cleaner spray can restore correct readings. Do not use brake cleaner or generic electrical contact cleaner as these leave residue that damages the sensing wire. Allow the sensor to dry completely before reinstalling. If cleaning does not resolve the fault codes, the sensor requires replacement.

What is the difference between a MAF sensor and a MAP sensor?

A MAF (Mass Air Flow) sensor directly measures the mass of air entering the engine using a hot wire element in the intake. A MAP (Manifold Absolute Pressure) sensor measures intake manifold pressure to calculate air density. Most modern engines use one or the other - some use both. Your vehicle service manual or OBD2 fault codes will confirm which sensor type your engine uses.

Will a faulty MAF sensor cause my vehicle to fail an emissions test?

Yes. A faulty MAF sensor causes the ECU to miscalculate fuel delivery, typically resulting in a rich running condition that increases CO and hydrocarbon emissions. Most roadworthy and emissions checks will fail a vehicle with an active MAF sensor fault code or visibly excessive exhaust smoke.

What are the symptoms of a bad MAF sensor?

Common symptoms include rough idle, hesitation or stumbling on acceleration, poor fuel economy, black smoke from the exhaust, and an illuminated Check Engine light. Your ECU may log fault codes P0100 to P0104.

Can I drive with a faulty MAF sensor?

You can drive short distances but it is not recommended. A faulty MAF sensor causes the ECU to run incorrect fuel mixtures, which can damage the catalytic converter and O2 sensors over time. Have it replaced as soon as possible.

How do I test if my MAF sensor is bad?

Use an OBD2 scanner to check for fault codes P0100-P0104. You can also use a multimeter or live data scanner to check the sensor output voltage against your vehicle's specification. A reading significantly outside spec confirms a faulty sensor.

What causes a MAF sensor to fail?

The most common causes are a dirty or contaminated sensing element (often from a missing or damaged air filter), oil contamination from an over-oiled aftermarket air filter, heat damage, or general wear over time.

Do I need to reset my ECU after replacing the MAF sensor?

It is good practice to clear any stored fault codes using an OBD2 scanner after replacement. Some vehicles will self-adapt within a short drive cycle, but clearing codes ensures the ECU recalibrates from a clean baseline.