Aftermarket - Europe en
A map of most of the surface of the Earth.
Français Español Italiano Deutsch

Mass Air Flow Sensor

Aftermarket multifunction air intake sensor MA394 by Spectra Premium

The mass air flow sensor calculates the quantity of air coming into the engine through the intake manifold. A sensor inside the MAF housing, or attached inside the air filter, detects the amount of air and relays the information to the Engine Control Unit (ECU).

Each Spectra Premium Mass Air Flow Sensor uses OE-quality ceramic board with superior heat dissipation properties to ensure long-term performance consistency
Related products: Ignition Distributor, Ignition Coil

Marketing Flyers

Visit our online catalog.

Part Components

Mass air flow sensor major components: premium grade seal, air chamber, ceramic circuit board and sensor element
Find Your Vehicle
Click here

How Does a MAF Sensor Work?

A sensor, either inside the MAF sensor housing or attached inside the air filter, detects the amount of air, and relays the information to the Engine Control Unit (ECU). The ECU will then use the mass air information to calculate the air-fuel ratio to be injected in the cylinders to ensure optimal combustion.

A faulty sensor can cause sub-optimal combustion leading to bad fuel economy and harmful emissions

Common MAF Sensor Failure Symptoms

  • Engine stalls soon after starting
  • Engine hesitates and jerks during acceleration
  • Engine hiccups
  • Unusual lean or rich idling

Common Causes of Failure

Mass air flow sensor units are very precise and fragile units. Contamination, such as dirt, rain, and smoke from ambient air, can accumulate around the sensor area. This accumulation cause erroneous sensor readings which will corrupt the fuel-air ratio calculations of the ECU.

Replacement importance

It is recommended to change the mass air flow sensor with the air filter, as a defective sensor causes reduced gas mileage. If not replaced in time, the defective sensor will harm Oxygen sensors, spark plugs and catalytic converters

Wrong calculations can cause the engine to run too rich or lean depending on the results, leading to bad fuel efficiency and potentially harmful emissions to be released into the atmosphere.