Mass Air Flow Sensor / Air Flow Meter for auto

Electric system auto parts: Mass Air Flow Sensor / Air Flow Meter

How to detect a faulty mass air flow meter

First, disconnect the flow meter, and try driving without it. Improved engine operation indicates a broken component. Then inspect the corrugated hose and the inner surface of the meter: there should be no moisture or dirt. Often, a damaged flow meter is indicated by damaged or missing rubber O-ring that serves to seal the seat of the component.

Working order of the mass air flow meter may be checked with the use of a multimeter. For this purpose, connect the probes of the device to the negative and the positive terminals of the signal wire, turn the ignition on, but do not start the engine, and then measure the voltage. It should not exceed 1.4 V. Failure of the flow meter of your car may be indicated by an increased engine power when a known-good flow meter is installed instead of the tested one.

You may notice that the mass air flow meter needs diagnostics by the following symptoms:

  • increased fuel consumption;
  • flashing lamps on the instrument panel;
  • unstable idle speed;
  • lit "Check Engine" indicator;
  • reduced power of the engine;
  • deteriorated dynamic performance of the vehicle;
  • the engine cannot be started.

Reasons of mass air flow meter malfunction

The component is very sensitive to fouling. Therefore, failure to replace the air filter in due time is one of the most common reasons of malfunction of the meter: the foul deposits on the surface of the sensing element will greatly reduce the accuracy and efficiency of measurements. Similar consequences may be caused by the loss of tightness of the intake air duct, which makes air get into the flow meter bypassing the filter.

Sometimes the cause of sensor failure is associated with malfunctions in the engine which are accompanied by the increased oil consumption: carbon deposit on the surface of the sensing element impedes the correct operation of the flow meter.

Mass air flow meter may also fail due to applying too intensive efforts when cleaning or wiping it, and due to installation errors.

Moisture and dirt can oxidize the terminals of the flow meter, which results in failure of power supply to the meter. While loosely fastened wires and connectors may cause a short circuit and subsequent burnout of the component.

Repairing and replacing the mass air flow meter

To restore normal operation of the flow meter, it is sufficient in some cases to clean dirt from it and rinse it. However, if that doesn't help, a new component is to be installed.

You can easily replace the flow meter yourself. Do the following:

  1. Turn off the engine.
  2. Disconnect the negative terminal from the battery.
  3. Extract the connector of the component after releasing the connector locks.
  4. Unscrew screws of the clamps, and disconnect the intake pipe from the air filter.
  5. Remove the faulty flow meter, and install a new one.
  6. Install all components in their places in the reverse order.
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Top quality parts Mass Air Flow Sensor / Air Flow Meter for your car
Article №: SKAS-0150135
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Parts Details
  • Housing Type: with housing
  • Length [mm]: 125
  • Inner diameter 1 [mm]: 108
  • Outer diameter 1 [mm]: 108
In stock Details
Article №: 3926A0013
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Parts Details
  • Voltage [V]: 12
  • Number of Poles: 4
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Parts Details
  • Voltage [V]: 12
  • Number of connectors: 5
  • Manufacturer Restriction: BOSCH
  • Weight [kg]: 0,24, 0,25
  • Supplementary Article/Info 2: with integrated air temperature sensor
  • Connector Shape: Oval
  • Length [mm]: 108
  • Width [mm]: 125
  • Height [mm]: 108
In stock Details
Article №: 3926A0068
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  • Number of connectors: 4
  • for article number: 558113
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  • Number of connectors: 5
  • Manufacturer Restriction: 8ET 009 142-541
  • Mounting Type: Bolted
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Article №: 3926A0019
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  • Supplementary Article/Supplementary Info: without suction pipe
  • Number of used contacts: 5
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Article №: 3926A0043
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  • Number of connectors: 4
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Article №: 3926A0007
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Parts Details
  • Recommended additional repairs: Air Filter
  • New Part:
  • Used part return not required:
In stock Details
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