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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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BOSCH 028021803F Luftmassenmesser BMW E81 E87 116i E46 316i 318i E90 E92 316i 13627566986

Item No.: A02213W298
Manufacturer: BOSCH
part number: 0 280 218 03F
EAN-Code: 4047023057525
Baugruppe: Gemischaufbereitung
64376066: Luftfilter
Verwendung: Luftmasse
Mengeneinheit: Stück
92,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

BOSCH 0280217814 Luftmassenmesser BMW 5er E39 540i 7er E38 740i X5 E53 M62 13621433567

Item No.: UNI531W063
Manufacturer: BOSCH
part number: 0 280 217 814
EAN-Code: 3165142422183
Baugruppe: Gemischaufbereitung
64376066: Luftfilter
Verwendung: Luftmasse
Mengeneinheit: Stück
117,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

FEBI 28338 Luftmassenmesser MERCEDES-BENZ W203 S203 W210 S210 W211 W463 W220 C208 C209

Item No.: UNI074W962
Manufacturer: FEBI BILSTEIN
part number: 28338
EAN-Code: 4027816283386
Baugruppe: Gemischaufbereitung
Fuer_Oe_Nummer: 113 094 00 48
Widerstandsart: Heißfilmmassensensor
Verwendung: Luftmasse
Mengeneinheit: Stück
Gewicht_kg: 0,248
86,25 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

BOSCH 0280218009 Luftmassenmesser für PORSCHE 911 + CABRIO (996) 3.4 - 3.6 GT2

PORSCHE: 99660612400 | Einschränkung beachten!

Item No.: A09213W291
Manufacturer: BOSCH
part number: 0 280 218 009
EAN-Code: 3165143082737
Baugruppe: Gemischaufbereitung
Gehaeusetyp: ohne Gehäuse
64376066: Luftfilter
Verwendung: Luftmasse
Mengeneinheit: Stück
131,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

VEMO Luftmassenmesser MERCEDES W204 S204 W212 R172 W166 X204 180-250 CDI 6510900248

Motor & Einschränkung beachten!

Item No.: A12213W308
Manufacturer: VEMO
part number: V30-72-0788
EAN-Code: 4046001798771
Baugruppe: Gemischaufbereitung
Fuer_Oe_Nummer: A 651 090 02 48
Verpackungshoehe_cm: 11,1
Gehaeusetyp: mit Gehäuse
Neuteil:
Verpackungsbreite_cm: 12,7
64374896:
Verwendung: Luftmasse
Mengeneinheit: Stück
Pol_Anzahl: 4
139,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

BOSCH 0928400529 Luftmassenmesser BMW E87 E46 E90-93 E60 E61 E65 X3 X5 X6 13627788744

Item No.: A02213W296
Manufacturer: BOSCH
part number: 0 928 400 529
EAN-Code: 4047023450210
Baugruppe: Gemischaufbereitung
64376066: Luftfilter
Verwendung: Luftmasse
Mengeneinheit: Stück
115,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

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

Item No.: UNI153W232
Manufacturer: HERTH+BUSS JAKOPARTS
part number: J5680313
Baugruppe: Gemischaufbereitung
Verwendung: Luftmasse
Mengeneinheit: Stück
150,95 EUR

incl. VAT, excl. shipping costs

short term available / 3-4 working days
add to cart

HERTH+BUSS ELPARTS Luftmassenmesser für MERCEDES W210 S210 E200/220CDI E300Turb

für Fahrzeuge bis Baujahr 08.1999

Item No.: UNI853W897
Manufacturer: HERTH+BUSS ELPARTS
part number: 70640200
Anschlussanzahl: 5
Baugruppe: Gemischaufbereitung
64376066: Luftfilter
Verwendung: Luftmasse
Mengeneinheit: Stück
Nennspannung_v: 12
117,95 EUR

incl. VAT, excl. shipping costs

short term available / 3-4 working days
add to cart

HERTH+BUSS JAKOPARTS Luftmassenmesser NISSAN Almera 2 (N16) + Hatchback 1.5 1.8

Einschränkung beachten!

Item No.: UNI133W842
Manufacturer: HERTH+BUSS JAKOPARTS
part number: J5681001
Baugruppe: Gemischaufbereitung
Verwendung: Luftmasse
Mengeneinheit: Stück
132,95 EUR

incl. VAT, excl. shipping costs

short term available / 3-4 working days
add to cart

HERTH+BUSS JAKOPARTS Luftmassenmesser für HONDA ACCORD VIII CIVIC IX VIII CR-V

auch für FR-V & HR-V

Item No.: UNI133W839
Manufacturer: HERTH+BUSS JAKOPARTS
part number: J5684001
Baugruppe: Gemischaufbereitung
Verwendung: Luftmasse
Mengeneinheit: Stück
154,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

HERTH+BUSS ELPARTS Luftmassenmesser für FORD COURIER 1.4i FIESTA IV 1.25i / 1.4

Item No.: UNI153W031
Manufacturer: HERTH+BUSS ELPARTS
part number: 70640303
Anschlussanzahl: 4
Baugruppe: Gemischaufbereitung
64376066: Luftfilter
Verwendung: Luftmasse
Mengeneinheit: Stück
Nennspannung_v: 12
129,95 EUR

incl. VAT, excl. shipping costs

short term available / 3-4 working days
add to cart

PIERBURG 7.07759.06.0 Luftmassenmesser BMW E36 325i E34 525/530i E39 535i E32 E38 730i

entspricht BMW OE-Nummer: 13 62 1 747 155

Item No.: UNI531W071
Manufacturer: PIERBURG
part number: 7.07759.06.0
EAN-Code: 4028977878015
Baugruppe: Gemischaufbereitung
Spannung_v: 12
Verwendung: Luftmasse
Mengeneinheit: Stück
Betriebsart: elektrisch
87,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart
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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.