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The air flow meter ensures the correct air-fuel mixture in the engine


The air mass meter or air mass sensor, abbreviated LMM, is an important sensor in the engine intake system. It is installed in petrol and diesel engines. The air mass sensor is located inside the intake pipe between air filter box and intake manifold. It not only ensures optimum engine performance, but also lower pollutant emissions. In the lower section we will go into more detail about the functions and design of the air mass sensor. We also describe possible defects and when cleaning is possible.

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HELLA Luftmassenmesser BMW 3er E46 320-328i 5er E39 520-528i E38 728i M52 M54

HELLA: 8ET 009 142-021 | BMW: 13 62 1 432 356

item ref.: A02213W299
manufacturer: HELLA
part number: 8ET 009 142-021
EAN-Nr.: 4082300131031
64375590: 80
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
Verwendung: Luftmasse
Montageart: Rohrstutzen
Anschlussanzahl: 3
70.95 EUR

incl. legal tax, + shipping fees

available
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PIERBURG Luftmassenmesser Luftmengenmesser LMM Sensor W203 W210 200/220/270 CDI

item ref.: A12213W294
manufacturer: PIERBURG
part number: 7.22684.07.0
EAN-Nr.: 4028977380327
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
Betriebsart: elektrisch
Verwendung: Luftmasse
64374570: SI 0104
Spannung_v: 12
51.95 EUR

incl. legal tax, + shipping fees

available
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BOSCH Luftmassenmesser Luftmengenmesser 0280217515 für Mercedes W202/203/210/211

auch C208 C209 W463 W163 W220 R129 R230 R170 Viano Vito

item ref.: A12213W293
manufacturer: BOSCH
part number: 0 280 217 515
EAN-Nr.: 3165142563336
64376066: Luftfilter
Verwendung: Luftmasse
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
100.55 EUR

incl. legal tax, + shipping fees

available
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VDO Luftmassenmesser BMW 3er E46 320-328i 5er E39 520-528i 7er E38 728i M52 M54

VDO: 5WK96050Z | BMW: 13 62 1 432 356

item ref.: A02213W297
manufacturer: VDO
part number: 5WK96050Z
EAN-Nr.: 4103590908070
Verwendung: Luftmasse
Mengeneinheit: Stück
Pol_Anzahl: 3
Baugruppe: Gemischaufbereitung
165.95 EUR

incl. legal tax, + shipping fees

available
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HERTH+BUSS JAKOPARTS Luftmassenmesser für MITSUBISHI CARISMA GALANT LANCER OUTL

auch für PAJERO SPACE RUNNER/WAGON SPACE STAR

item ref.: UNI363W841
manufacturer: HERTH+BUSS JAKOPARTS
part number: J5685006
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
Nennspannung_v: 12
Anschlussanzahl: 7
64376066: Luftfilter
Verwendung: Luftmasse
257.95 EUR

incl. legal tax, + shipping fees

Only some available
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HERTH+BUSS ELPARTS Luftmassenmesser ALFA ROMEO für CITROEN FORD PEUGEOT VOLVO D

für Fzg. mit 1.8 / 1.9 / 2.0 / 2.2 / 2.4 / 3.2 Diesel

item ref.: UNI363W926
manufacturer: HERTH+BUSS ELPARTS
part number: 70640307
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
Nennspannung_v: 12
64376066: Luftfilter
Verwendung: Luftmasse
Anschlussanzahl: 4
60.95 EUR

incl. legal tax, + shipping fees

Only some available
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HERTH+BUSS JAKOPARTS Luftmassenmesser für HYUNDAI MATRIX KIA CERATO 1.5/2.0 CRDi

item ref.: UNI153W232
manufacturer: HERTH+BUSS JAKOPARTS
part number: J5680313
Verwendung: Luftmasse
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
150.95 EUR

incl. legal tax, + shipping fees

Only some available
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HERTH+BUSS ELPARTS Luftmassenmesser 70640039 für ALFA ROMEO FIAT LANCIA

item ref.: UNI153W016
manufacturer: HERTH+BUSS ELPARTS
part number: 70640039
EAN-Nr.: 4050326216742
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
Nennspannung_v: 12
64376066: Luftfilter
Verwendung: Luftmasse
Anschlussanzahl: 5
74.95 EUR

incl. legal tax, + shipping fees

Only some available
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HERTH+BUSS ELPARTS Luftmassenmesser OPEL Astra F Calibra A Omega B Vectra A 2.0i

item ref.: UNI153W453
manufacturer: HERTH+BUSS ELPARTS
part number: 70640128
Verwendung: Luftmasse
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
71.95 EUR

incl. legal tax, + shipping fees

Only some available
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HERTH+BUSS ELPARTS Luftmassenmesser für SEAT ALHAMBRA LEON VW BORA GOLF 4 PASSA

item ref.: UNI153W448
manufacturer: HERTH+BUSS ELPARTS
part number: 70640011
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
Nennspannung_v: 12
64376066: Luftfilter
Verwendung: Luftmasse
Anschlussanzahl: 5
62.95 EUR

incl. legal tax, + shipping fees

Only some available
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HERTH+BUSS ELPARTS Luftmassenmesser Luftmengenmesser 70640150 für AUDI SEAT SKO

item ref.: UNI153W027
manufacturer: HERTH+BUSS ELPARTS
part number: 70640150
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
Nennspannung_v: 12
64376066: Luftfilter
Verwendung: Luftmasse
Anschlussanzahl: 4
90.95 EUR

incl. legal tax, + shipping fees

Only some available
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HERTH+BUSS JAKOPARTS Luftmassenmesser für HYUNDAI ACCENT II GETZ MATRIX 1.5 CRDi

item ref.: UNI853W620
manufacturer: HERTH+BUSS JAKOPARTS
part number: J5680501
Verwendung: Luftmasse
Mengeneinheit: Stück
Baugruppe: Gemischaufbereitung
126.95 EUR

incl. legal tax, + shipping fees

Only some available
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The tasks of the air flow meter

On the one hand, the mass airflow sensor measures the quantity of air flowing through, on the other hand it determines the humidity and the temperature of the air drawn in. The values obtained by the measurement are forwarded to the engine control unit. The mass airflow sensor then calculates the amount of fuel required for the optimum composition of the air-fuel mixture and the ignition timing. In diesel engines, the mass airflow sensor also influences the control of the exhaust gas recirculation. The combustion process in the engine is constantly optimized by an exact ratio between air and fuel mass, so that the engine can operate economically and with low emissions. The optimization of the mixture preparation enables compliance with the prescribed exhaust gas standards and the reduction of harmful emissions. The air mass sensor therefore has a very important task in engine management.

The mass airflow sensor is often confused with the older component "airflow sensor", which can only be found in older vehicles. An air flow meter can only determine the volume of the sucked in air. This is not sufficient to adjust the mixture exactly to the respective conditions and circumstances of temperature. Therefore nowadays only the air flow meter is installed.

The designs of the LMM briefly explained

Overall, the LMM can be divided into two designs:

  1. The hot-wire mass airflow sensor
    The older design is the so-called hot-wire air mass meter, which is currently still the most common. This contains a wire which is constantly 100°C above the temperature of the sucked in air. Depending on the driving style more or less air mass is sucked in. The air mass comes into contact with the heating wire and cools it down. Because the temperature of the wire is permanently balanced, the size of the required current can be taken as a measure of the air mass. The engine control unit collects and processes the information and regulates the corresponding fuel quantity. The air mass is measured about 1000 times per second. After the engine is switched off, the hot wire is heated briefly to a very high temperature of about 1000 °C. The purpose of this is to burn off impurities and to keep the LMM functioning properly.

  2. The hot-film mass airflow sensor
    The newer design is the so-called hot film air mass meter, which works with a sensor plate instead of a heating wire. Also with this type of air mass sensor, the air mass is determined by the temperature difference measured by the sensor and the intake air. The result is then transmitted to the engine control unit and the required fuel quantity is calculated. An essential advantage over the heating wire air mass sensor is that no exhaust gas particles are deposited. This means that it is no longer necessary to burn off the impurities. Modern air mass sensors measure humidity and pressure signals in addition to temperature.

Possible symptoms of a defective air mass sensor

Air flow meters also wear out over time. The following symptoms may indicate this:

  • loss of motor power, fluctuations at low speed
  • unstable idling and starting problems
  • poor exhaust gas values including black smoke development
  • The engine indicator light comes on.

If these signs are due to a defective LMM, it transmits an incorrect voltage signal to the control unit. This results in too little or too much fuel being injected. The causes can be deposits such as dried oil, water or fuel residues as well as dust or dirt. These usually reach the air mass sensor due to a defective or dirty air filter. Therefore it is also important not to forget the engine air filter during the inspection. But other components in the intake system, ignition system or turbocharger can also cause the above-mentioned complaints. Troubleshooting should be carried out professionally, as a lot of components can cause similar symptoms. In some cases, cleaning the mass airflow sensor is sufficient so that the sensor measures the correct values again. However, care should be taken here as the sensor parts are very sensitive to touch. Driving on with a defective LMM leads to a much higher fuel consumption and, if present, to switching to the emergency program. At the same time the engine power is throttled down. It is therefore advisable to determine the exact cause of the problem as quickly as possible.

Clean or replace the air mass sensor?

If a LMM no longer functions as it should, some people try to clean the air flow meter first. For this purpose, newer vehicles require special tools and generally a special cleaner. As this is a very sensitive technique, experience and tact is required. It is not always crowned with success to clean an air flow meter, and then an exchange becomes necessary after all.

If the old LMM has to be replaced, the amount of work is not very large. Usually only the engine cover and the air intake pipe have to be removed. Caution is nevertheless necessary, because the air mass sensor is very sensitive. With a newer LMM you may need special tools. Depending on the vehicle manufacturer, it may be necessary to re-teach the control unit after installation of the new air mass sensor, so that the engine management system is informed about the new component. In some vehicles, the mass airflow sensor is integrated in the engine control unit, which makes repair much more complex and also more expensive.

We recommend high-quality replacement parts, especially for a sensitive component such as the air flow meter. Bosch, for example, is the original equipment manufacturer for many BMW and Mercedes-Benz vehicles. But you can also find Pierburg, Hella, Herth+Buss, Magneti Marelli and many other well-known manufacturers at reasonable prices. If you are unsure which LMM is suitable for your vehicle, please contact our customer service with the 17-digit chassis number of your vehicle.

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