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What is the function of the exhaust gas recirculation valve?


The exhaust gas recirculation valve, or EGR valve for short, is part of the exhaust gas recirculation system. In diesel engines, its primary purpose is to reduce nitrogen oxides. In gasoline engines, the main task of exhaust gas recirculation is to reduce fuel consumption. Basically, exhaust gas recirculation, as the name suggests, returns exhaust gases to the intake tract. This means that less fresh air, i.e. oxygen, is introduced, which means that less fuel is injected. The temperature in the combustion chamber is thus lower. This also reduces the amount of nitrogen oxides produced. In gasoline engines, exhaust gas recirculation allows the throttle valve to be opened further, resulting in fewer pressure losses, which in turn also leads to lower fuel consumption. Exhaust gas recirculation only comes into play in eco mode or part-load operation. If full power is required from the engine, the EGR system is switched off.

The EGR valve is the control instrument for exhaust gas recirculation. Among other things, the engine control unit uses data from the air flow meter and the lambda sensor to determine how much exhaust gas is to be recirculated and when, and passes this information on to the EGR valve. This is usually located behind the engine in the EGR pipe that leads back to the intake manifold. By opening the valve, the EGR valve clears a path for the exhaust gases to travel to the intake manifold. In the lower section of the pages, we go into more detail about why an EGR valve can go defective and what symptoms you can recognize this by. In addition, we clarify the question of whether an EGR valve can be cleaned and give a few tips on what to look out for when buying an EGR valve.

How can the EGR valve go defective and what are the symptoms of this?
What to consider when buying an EGR valve?

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Rohrleitung AGR Ventil OPEL Astra H Signum Vectra C Zafira B 1.9 CDTI 5851405

vom OPEL Erstausrüster | OPEL OE-Nr. 55202704

Item No.: A16213W354
Manufacturer: OPEL
part number: 55202704
Baugruppe: Abgasrückführung
Verwendung: AGR-Ventil
Mengeneinheit: Stück
instead of 264,42 EUR 75,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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ELRING 051202 Dichtung Leitung AGR-Ventil MERCEDES W204 W211 W164 Vito Viano W639 OM642

Mercedes-Benz OE-Nummer: 6421421880

Item No.: UNI313W176
Manufacturer: ELRING
part number: 051.202
EAN-Code: 4041248398920
7,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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AIC 54905 AGR Ventil FIAT Ducato Croma (194) Grande Punto (199) Sedici 1.9D 2.2/2.3D

Item No.: A08213W355
Manufacturer: AIC
part number: 54905
EAN-Code: 4046283549054
Anschlussanzahl: 5
Baugruppe: Abgasrückführung
Verwendung: Abgasrückführung
Mengeneinheit: Stück
64374267: mit Dichtungen
Betriebsart: elektrisch
91,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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PIERBURG AGR Kühler Abgasrückführung AUDI A4 B8 A5 A6 C6 Q5 8RB 2.7/3.0TDI 059131515ET

auch für PORSCHE Cayenne (92A) 3.0 Diesel & VW Touareg (7P) 3.0 V6 TDI

Item No.: A18213W352
Manufacturer: PIERBURG
part number: 7.01106.38.0
EAN-Code: 4028977776120
Baugruppe: Abgasrückführung
64374570: SI 1003-21
Material: Aluminium
Mengeneinheit: Stück
Betriebsart: elektrisch
373,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

WAHLER 710327D AGR Ventil BMW 1er E87 F20 3er E90 F30 5er X3 X5 2.0/3.0D 11717810871

für alle neueren 2l und 3l Dieselmotoren (1995/2993ccm)

Item No.: A02213W337
Manufacturer: WAHLER
part number: 710327D
EAN-Code: 4029783011238
Baugruppe: Abgasrückführung
Verwendung: Abgasrückführung
Mengeneinheit: Stück
64374267: with seal
Betriebsart: elektrisch
123,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

NRF 48366 Kühler Abgasrückführung AGR-Ventil BMW F20 F30 F33 F10 F07 F11 F26 11717823210

auch für BMW X3 F25 X5 F15 X6 F16 6er F12 F13 7er F01

Item No.: UNI593W563
Manufacturer: NRF
part number: 48366
EAN-Code: 8718042304582
Baugruppe: Abgasrückführung
Material: Edelstahl
Mengeneinheit: Stück
Betriebsart: pneumatisch
Fuer_Fahrzeugausstattung: mit Blue Performance
346,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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HERTH+BUSS JAKOPARTS AGR Ventil HYUNDAI Santa Fe 1 (SM) Sonata 4 (EF) 2.4 16V

Item No.: UNI203W826
Manufacturer: HERTH+BUSS JAKOPARTS
part number: J5690507
53,53 EUR

incl. VAT, excl. shipping costs

short term available / 3-4 working days
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HERTH+BUSS ELPARTS AGR Ventil ROVER 200 25 I (RF) 400 II 45 I (RT) 600 I (RH) 86-113 PS

Item No.: UNI973W348
Manufacturer: HERTH+BUSS ELPARTS
part number: 70671600
54,56 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

HERTH+BUSS ELPARTS AGR Ventil LAND ROVER Defender (L316) 2.5 TDI 4x4 113 PS

Item No.: UNI973W349
Manufacturer: HERTH+BUSS ELPARTS
part number: 70671601
47,56 EUR

incl. VAT, excl. shipping costs

short term available / 3-4 working days
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HERTH+BUSS ELPARTS AGR Ventil OPEL Astra J Corsa D Meriva B Mokka X 1.7 CDTI 110/131 PS

Item No.: UNI203W277
Manufacturer: HERTH+BUSS ELPARTS
part number: 70671415
199,62 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

Dichtung für AGR Ventil CHRYSLER JEEP MERCEDES OM642 280CDI 300CDI 320CDI 350CDI

entspricht MERCEDES OE-Nummer: 642 142 18 80

Item No.: A12313W902
Manufacturer: FA1
part number: 140-997
Baugruppe: Abgasrückführung
Verwendung: AGR-Ventil
Mengeneinheit: Stück
5,55 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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NRF EASY FIT AGR-Modul AUDI A1 SEAT Ibiza 4 SKODA Fabia 2 VW Polo (6R1 6C1)

Item No.: UNI593W787
Manufacturer: NRF
part number: 48214
EAN-Code: 8718042168917
Dicke_Staerke_mm: 50
Baugruppe: Abgasrückführung
Breite_mm: 73
Guete_Klasse: Easy Fit
Form: oval
Mengeneinheit: Stück
Pol_Anzahl: 5
Supplementary Article/Supplementary Info 2: mit AGR-Ventil
Hoehe_mm: 175
Betriebsart: elektrisch
163,95 EUR

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of 34

How can the EGR valve go defective and what are the symptoms of this?

The EGR valve is one of the most important components of external exhaust gas recirculation. In external exhaust gas recirculation, an EGR pipe leads from the engine outlet back to the intake tract. In addition to the EGR valve, the EGR pipe often also contains an AGR cooler. The EGR cooler reduces the exhaust gas temperature even further, so that the temperature in the combustion chamber is also reduced even further, and with it the nitrogen oxide content.

Only if the exhaust gas recirculation valve functions correctly can the recirculated exhaust gas quantity be precisely metered. However, since it is located directly in the exhaust gas flow, it is exposed to constant high thermal loads. Even in combination with an EGR cooler, the temperatures of the exhaust gases are still very high or there are additional high temperature differences. These stress the material and can lead to wear. Deposits also stress the material and can clog the EGR valve. Most of the deposits are soot particles contained in the exhaust gases. But oil residues due to a defective cylinder head gasket can also cause an EGR valve to become defective. The deposits coke together with the valve due to the high temperatures and become very encrusted over time. This means that the exhaust gas recirculation valve can no longer open as well or close sufficiently. As a result, the exhaust gas recirculation system can no longer function adequately. This then also affects the main inspection, as the increased exhaust gas values represent a significant defect.

If an EGR valve is defective, the following signs may indicate this:

  • The engine jerks when you step on the gas
  • There is fluctuation at idle
  • The engine warning light flashes
  • There is a sudden loss of engine power
  • Fuel consumption increases
  • Black clouds of exhaust gas are emitted

In the worst case, even the emergency program switches on and the car can only be driven with throttled performance.

In many cases, it would be enough to clean the EGR valve, but this requires several hours of work, as stubborn deposits can only be removed if the EGR valve has been removed. Only after installation can you tell whether the EGR valve is working properly again. If it does not, it must be replaced and thus requires twice the amount of work. For this reason, experts recommend not cleaning a defective EGR valve, but replacing it directly. The effort is due to the fact that many components must first be removed from the engine in order to reach the EGR valve. Preventively, however, it can be worthwhile to clean the EGR valve regularly. For this purpose, there are so-called AGR valve cleaners. These are sprayed into the engine's intake tract, where they loosen lighter contaminants. This can significantly extend the life of the EGR valve.

What to consider when buying an EGR valve?

To buy an EGR valve is important to clarify in advance what components are needed. Are seals and / or the EGR pipe also needed or is it a combined device consisting of the exhaust gas recirculation module and the EGR cooler? Since the EGR valve differs for each vehicle, it makes sense to first select the vehicle to reduce the range to only suitable items. For the remaining exhaust gas recirculation valves, the restrictions must then still be observed.

In our assortment is exclusively branded goods in original equipment quality to find. You can choose from the following well-known brand manufacturers:

Each supplier manufactures the EGR valves from high-quality materials that guarantee a long service life. In addition, they meet the manufacturer's specifications and thus convince with an excellent price-performance ratio. If you are unsure which EGR valve to buy, please feel free to contact our customer service with the 17-digit chassis number.