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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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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
???item.ean.code???: 4029783011238
Mengeneinheit: Stück
64374267: with seal, ohne Anbaumaterial
Verwendung: Abgasrückführung
Baugruppe: Abgasrückführung
Betriebsart: elektrisch
101,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

VALEO AGR Ventil Abgaskühler + Dichtungen AUDI A4 B8 A5 8T 8F A6 C7 Q5 8R 2.0 TDI

inkl. DICHTUNGEN | VALEO 700436 | AUDI: 03L 131 512 DT

Item No.: PKT772W662
Manufacturer: VALEO
part number: 700436, 411-540
???item.ean.code???: 3276427004366
Delivery:

  • 1x EGR Module Piece - VALEO 700436
  • 1x Seal, EGR valve Piece - 03L 131 547 N
  • 1x Seal, EGR valve Piece - FA1 411-540
236,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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WAHLER AGR Ventil Abgasrückführungsventil AUDI A3 8P VW Golf 5 Polo 9N Bora 1.9 2.0 TDI

MIT DICHTUNGEN, u.a. für A3 GOLF PASSAT TOURAN OCTAVIA

Item No.: A18213W342
Manufacturer: WAHLER
part number: 7496D
???item.ean.code???: 4029783008849
Mengeneinheit: Stück
64374267: mit Dichtungen
Betriebsart: pneumatisch
Verwendung: Abgasrückführung
Baugruppe: Abgasrückführung
35,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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AIC Kühler AGR-Ventil Abgasrückführung Kühlermodul für VW TOUAREG TRANSPORTER T5

für 2.5 RS TDI & 2.5 TDI / 4 Motion | VW-Nr: 070131512F

Item No.: A18213W394
Manufacturer: AIC
part number: 57059
???item.ean.code???: 4046283570591
Mengeneinheit: Stück
Betriebsart: pneumatisch
Neuteil:
Baugruppe: Abgasrückführung
145,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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WAHLER 7649D AGR Ventil + Dichtung VW Transporter Multivan T5 2.5 TDI 070128070E

Item No.: A18213W366
Manufacturer: WAHLER
part number: 7649D
???item.ean.code???: 4029783010842
Mengeneinheit: Stück
64374267: mit Dichtungen
Betriebsart: pneumatisch
Verwendung: Abgasrückführung
Baugruppe: Abgasrückführung
74,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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NRF AGR-Modul EASY FIT VW Multivan / Transporter T5 Touareg 7L 2.5 TDI 070131512F

Item No.: UNI593W793
Manufacturer: NRF
part number: 48313
???item.ean.code???: 8718042301031
Breite_mm: 54
Mengeneinheit: Stück
Hoehe_mm: 365
Baugruppe: Abgasrückführung
Dicke_Staerke_mm: 54
Guete_Klasse: Easy Fit
133,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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HERTH+BUSS JAKOPARTS AGR Ventil für CHEVROLET DAEWOO AVEO KALOS MATIZ SPARK

Item No.: UNI953W360
Manufacturer: HERTH+BUSS JAKOPARTS
part number: J5690902
Mengeneinheit: Stück
64374267: with seal
Nennspannung_v: 12
Verwendung: Abgasrückführung
Baugruppe: Abgasrückführung
Anschlussanzahl: 5
95,95 EUR

incl. VAT, excl. shipping costs

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

VEMO Ladedruckregelventil PORSCHE 996 3.6 Turbo GT2 GT3 Cayenne 9PA Turbo 4.5 Panamera 970

PORSCHE: 996 605 155 00 | für Panamera 4.8 Turbo

Item No.: A09213W300
Manufacturer: VEMO
part number: V45-63-0006
???item.ean.code???: 4046001831003
Einbauseite: motorseitig
Ventilart: Umschaltventil
Betriebsart: elektrisch
Mengeneinheit: Stück
Verwendung: Ladedruckregelung
Verpackungsbreite_cm: 4
Pol_Anzahl: 2
Spannung_v: 12
Verpackungshoehe_cm: 6,7
Baugruppe: Luftversorgung
16,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
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PIERBURG AGR Ventil Abgasrückführungsventil für Opel Corsa B X12XE 7.22414.08.0

inkl. Dichtung | Opel: 58 51 029 | GM: 09117397

Item No.: A16213W329
Manufacturer: PIERBURG
part number: 7.22414.08.0
???item.ean.code???: 4028977627965
Mengeneinheit: Stück
64374267: with seal
64374570: SI 1830
Verwendung: Abgasrückführung
Ventilart: Magnetventil
Baugruppe: Abgasrückführung
Spannung_v: 12
Betriebsart: elektrisch
111,05 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

AGR Ventil FORD Fiesta 5 6 1.4TDCi 68 PS ab 02.2004 Fusion 1.4 TDCi PEUGEOT 107 206 207

mit Original Ford Dichtung | OE: 1 682 736 + 1 229 959

Item No.: PKT262W650
Manufacturer: KEINE ANGABE
part number: 1 229 959
Delivery:

  • 1x EGR Valve Piece - 1 682 736
  • 1x Seal, EGR valve Piece - FORD 1 229 959
138,95 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart

HERTH+BUSS ELPARTS AGR Ventil AUDI A2 SEAT Cordoba VW Fox Polo SKODA Fabia

auch für SKODA FABIA II ROOMSTER

Item No.: UNI533W416
Manufacturer: HERTH+BUSS ELPARTS
part number: 70671014
Mengeneinheit: Stück
64374267: with seal
Betriebsart: pneumatisch
Verwendung: Abgasrückführung
Ventilart: Membranventil
Baugruppe: Abgasrückführung
111,95 EUR

incl. VAT, excl. shipping costs

Currently not available at the time

PIERBURG Ladedruckventil Ladedruck Turbolader OPEL Astra G H Zafira A B 2.0 OPC

auch für SPEEDSTER | entspricht OE: 5850129 / 55557806

Item No.: A16213W334
Manufacturer: PIERBURG
part number: 7.01024.02.0
???item.ean.code???: 4028977506628
Mengeneinheit: Stück
Verwendung: Ladedruckregelung
Ventilart: Taktventil
Spannung_v: 12
Baugruppe: Luftversorgung
64374570: SI 0096
Betriebsart: elektrisch
25,00 EUR

incl. VAT, excl. shipping costs

available / 1-2 working days
add to cart
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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.