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What is a lambda sensor and how does it work?


The lambda sensor measures the oxygen content in the exhaust gas stream and transmits the information in the form of an electrical voltage to the engine control unit. This can then adjust the fuel-to-air ratio for the combustion chamber to achieve optimum combustion and thus the best possible engine performance. In its measurement, the lambda sensor compares the oxygen content from the exhaust gas with the content of the ambient air. If the oxygen content is higher the fuel mixture is too thin, then there is more air in the combustion chamber than is necessary for the fuel. If the value is below the reference value, then the mixture is too thick, i.e. not enough air is present to completely burn the fuel. If the mixture is correctly adjusted, the pollutants that are released into the environment are minimized. In addition, the control sensor ensures an ideal initial value for the exhaust gas purification in the catalytic converter. Only when the exhaust gas mixture has the right ratio can the catalytic converter achieve the best result. Last but not least, a lambda sensor also reduces fuel consumption.

The lambda sensor is generally located in the exhaust manifold or directly in front of the catalytic converter. Then the lambda sensor is also called a control sensor. In addition, there may be a wide lambda sensor after the catalytic converter. This is also called a diagnostic probe and serves mainly as a control probe. It performs the same measurement. Smaller deviations can be compensated for by the engine control unit. In the case of larger deviations, an error is signaled. At the bottom of the page, we describe why a lambda sensor can go defective and what to look for when buying a lambda sensor.

How can a lambda sensor become defective and what are the symptoms?
What to consider when buying a lambda sensor?

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BOSCH 0281004746 Lambdasonde NACH Kat BMW 3er F30 1er F20 5er F10 B37 B47 N47 13628589104

Einschränkungen beachten!

Item No.: UNI531W616
Manufacturer: BOSCH
part number: 0 281 004 746
EAN-Code: 4047026552621
117,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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2x BOSCH 0258003477 Lambdasonde VOR KAT für BMW E46 320-330i E39 E60 E61 E38 E65

auch für X3 E83 X5 E53 Z3 Z4 | BMW OE Nr. 11781742050

Item No.: PKT872W385
Manufacturer: BOSCH
part number: 0 258 003 477
EAN-Code: 3165142800189
Delivery:

  • 2x Lambda Sensor Piece - BOSCH 0 258 003 477
107,95 EUR

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BOSCH 0258017213 Lambdasonde VOR Kat PORSCHE 997 3.8 Turbo / S 500/530PS 9A160612800

Item No.: A09564W541
Manufacturer: BOSCH
part number: 0 258 017 213
EAN-Code: 4047025124317
64375388: 250000
Abgasanlage: vor Katalysator
Anzahl_Der_Leitungen: 5
Baugruppe: Gemischaufbereitung
Einbauseite: beidseitig
Laenge_Ueber_Alles_mm: 850
Mengeneinheit: Stück
Verwendung: Lambdawert
96,95 EUR

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NOx-Sensor Lambdasonde OPEL Zafira Tourer C 1.6 CDTI 855608 / 55487677

vom OPEL Erstausrüster

Item No.: A16214W585
Manufacturer: OPEL
part number: 55501897
Baugruppe: Abgasanlage
Mengeneinheit: Stück
Verwendung: NOx-Wert (Harnstoffeinspritzung)
instead of 569,55 EUR 277,95 EUR

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BOSCH 0258006826 Lambdasonde NACH Kat PORSCHE 997 3.6 Turbo / GT2 99760613802

für Fahrzeuge bis Baujahr 08.2009

Item No.: A09564W539
Manufacturer: BOSCH
part number: 0 258 006 826
EAN-Code: 4047024326927
64375388: 250000
Abgasanlage: nach Katalysator
Anzahl_Der_Leitungen: 4
Baugruppe: Gemischaufbereitung
Einbauseite: beidseitig
Laenge_Ueber_Alles_mm: 615
Mengeneinheit: Stück
Verwendung: Lambdawert
70,95 EUR

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BOSCH 0258006171 Lambdasonde vor Kat OPEL Astra G H Corsa C Zafira A B 24403182

BOSCH: 0 258 006 171 | Opel: 8 55 355 | vor Katalysator

Item No.: A16564W570
Manufacturer: BOSCH
part number: 0 258 006 171
EAN-Code: 3165143171134
64375388: 160000
Anzahl_Der_Leitungen: 4
Baugruppe: Gemischaufbereitung
Laenge_Ueber_Alles_mm: 549
Mengeneinheit: Stück
Verwendung: Lambdawert
56,95 EUR

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BOSCH 0258010200 Lambdasonde NACH Kat PORSCHE 997 3.8 Turbo / S 500/530 PS 9A160613801

Item No.: A09564W542
Manufacturer: BOSCH
part number: 0 258 010 200
EAN-Code: 4047025123914
64375388: 250000
Abgasanlage: nach Katalysator
Anzahl_Der_Leitungen: 4
Baugruppe: Gemischaufbereitung
Einbauseite: beidseitig
Laenge_Ueber_Alles_mm: 840
Mengeneinheit: Stück
Verwendung: Lambdawert
74,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

DELPHI Lambdasonde vor Kat Opel Agila A Astra H Combo Corsa C D Tigra B 24420594

entspricht OPEL-Nr: 855406 | Regelsonde vor Katalysator

Item No.: A16564W583
Manufacturer: DELPHI
part number: ES20314-12B1
EAN-Code: 5012759388679
Baugruppe: Gemischaufbereitung
Kabellaenge_mm: 520
Lambdasonde: Planarsonde, beheizt
Mengeneinheit: Stück
Verwendung: Lambdawert
44,75 EUR

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available / 1-2 working days
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BOSCH 0281004742 Lambdasonde BMW G20/21 G30/31 G32 G11 G14/15/16 X3 G01 X5 G05 B47 B57

Item No.: A02564W558
Manufacturer: BOSCH
part number: 0 281 004 742
EAN-Code: 4047026557558
83,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

BOSCH 0258003011 Lambdasonde VOR Kat PORSCHE 924 2.5 S 944 2.5-3.0 968 3.0 94460613502

Item No.: A09564W511
Manufacturer: BOSCH
part number: 0 258 003 011
EAN-Code: 3165141861969
64375388: 100000
Anzahl_Der_Leitungen: 3
Baugruppe: Gemischaufbereitung
Laenge_Ueber_Alles_mm: 952
Mengeneinheit: Stück
Verwendung: Lambdawert
66,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

BOSCH 0258003048 Lambdasonde VOR Kat PORSCHE 928 S / GT / GTS 92860612801

Item No.: A09564W534
Manufacturer: BOSCH
part number: 0 258 003 048
EAN-Code: 3165142868417
64375388: 100000
Anzahl_Der_Leitungen: 3
Baugruppe: Gemischaufbereitung
Laenge_Ueber_Alles_mm: 670
Mengeneinheit: Stück
Verwendung: Lambdawert
56,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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BOSCH 0281004028 Lambdasonde BMW E46 F20 F30/31/34 F32/33/36 F10/11 F01 M47 M57 N47 N57

Bitte Einschränkungen beachten!

Item No.: UNI214W163
Manufacturer: BOSCH
part number: 0 281 004 028
EAN-Code: 4047024241381
64375388: 250000
Anzahl_Der_Leitungen: 5
Baugruppe: Gemischaufbereitung
Laenge_Ueber_Alles_mm: 540
Mengeneinheit: Stück
Verwendung: Lambdawert
98,95 EUR

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of 37

How can a lambda sensor become defective and what are the symptoms?

For a lambda sensor to work correctly, it must be at operating temperature. This is done with the hot exhaust gases. If the engine is still warming up, a heating element in the control sensor takes over the heating in newer vehicles. Only from a temperature of over 350°C, a control probe can make correct evaluations. This is precisely the first sticking point. If only short distances are driven, most of the heating power must be provided by the heating element. However, this is not designed for continuous power and can become defective if the load is too high.

The lambda sensor also becomes dirty over time, as the pollutants in the exhaust gases are deposited on it. This means that the control sensor can no longer measure correctly. If, for example, engine oil enters the combustion chamber due to damage to the cylinder head gasket or defective piston rings, and residues of this oil subsequently end up in the exhaust gases, this can also clog the lambda sensor upstream of the catalytic converter. Excessive exhaust gas temperatures above 950°C due to combustion malfunctions and the use of leaded fuel also cause faster wear. In addition, incorrect cleaning of the control sensor can poison the reference air, which also means that correct measurement can no longer be carried out. For this reason, a lambda sensor must not be cleaned with contact spray before the catalytic converter.

A defective lambda sensor can cause the following symptoms:

  • The engine power decreases
  • Increased fuel consumption occurs
  • The exhaust gases turn dark
  • The check engine light comes on

These symptoms do not always mean that the lambda sensor is defective. This can also be due to other causes. Therefore, the fault memory should be read out first. An additional visual inspection is also useful, because like spark plugs, lambda sensors have different wear profiles. A lambda sensor tester can also confirm whether the lambda sensor is really defective. Only then is it worth considering replacement. The diagnostic sensor, i.e. the lambda sensor after the catalytic converter, is usually less affected by wear. To be on the safe side, however, this should also be checked so that the wrong one is not accidentally replaced and the fault persists.

What to consider when buying a lambda sensor?

It is important before buying a lambda sensor to clarify at which point it should be replaced. Position 1 describes the lambda sensor before the cat (control probe), position 2 the lambda sensor after the cat (diagnostic probe). In addition, it can also be distinguished whether it is heated or unheated. In older vehicles, only unheated control probes are used, since the exhaust system there is not yet sufficiently developed. In addition, the number of lines and the type of connector connections differ for each vehicle, as does the length of the cable.

Therefore, if you want to buy a lambda sensor, it is recommended to first select the vehicle. Then the products are reduced to only suitable results. With the remaining offers can be selected from various well-known brand manufacturers. We carry high-quality spare parts from the following brand manufacturers:

They are all characterized by a high level of know-how and use only high-quality materials. Their products meet all the requirements of the vehicle manufacturer and can therefore be used without hesitation.

In addition to lambda sensors, this category also includes NOx sensors. NOx sensors function in a similar way to lambda sensors, except that they measure the proportion of nitrogen oxides rather than the oxygen content. Generally, NOx sensors are used in addition to the lambda sensor and are predominantly used in diesel engines. Their measurement is used, for example, to control the proportion of diesel additives such as AdBlue.

If you are unsure which NOx sensor or lambda sensor to purchase, please feel free to contact our customer service with the 17-digit chassis number.