Troubleshooting in exhaust gas recirculation system

Info: The article, including the images and technical data used, is based on service information SI0100

Exhaust gas recirculation (EGR) is a reliable and practice-proven method of emission control: As a result of exhaust gas, the oxygen content in the air-fuel mixture is reduced, and consequently the combustion temperature in the cylinders lowered. Since harmful nitrogen oxides (NOx ) are mainly produced at high temperatures and pressures, it is possible to reduce the NOx concentrates emitted to the environment by up to 50%. On diesel engines, the formation of soot particulates is lowered by approx. 10%.

Principle of exhaust gas recirculation (pneumatic)
1 Air fi lter
2 Air mass sensor
3 Throttle valve/control fl ap
4 Cylinder
5 EGR valve (in this case:pneumatic)
6 Electropneumatic pressure transducer
7 Lambda probe (Otto)
8 Catalytic converter 

Exhaust gas recirculation is only activated at defi ned operating points. On petrol engines this is normally the case above idling and up to upper part load, on diesel engines up to approx. 3000 rpm and medium load.

Components of exhaust gas recirculation system (EGR)

The EGR valve meters the amount of recirculated exhaust gas. It is added either at the exhaust manifold or at the intake air system, or it is located in a heatresistant exhaust-gas pipe which connects the exhaust manifold to the intake air system. Pneumatic EGR valves are actuated by way of vacuum via electromagnetic valves: On basic systems with an electric switchover valve, the EGR valve only has an open-close function. On systems provided with an electro-pneumatic pressure transducer (EPW), the EGR valve is infi nitely adjustable. The vacuum is taken from the intake manifold or generated by a vacuum pump.

Electric or electromotive EGR valves are actuated direct by the control unit and no longer need any vacuum or solenoid valve.

EGR valves on diesel vehicles have large opening cross-sections because of their high return rates.
Left: Pneumatic EGR valve
Centre: Pneumatic EGR valve with position detection
Right: Electric EGR double-seat valve

On EGR valves in petrol engines, the cross-sections are considerably smaller.
Left: Electric EGR valve with connection to the coolant circuit
Centre: Pneumatic EGR valve
Right: Electric EGR valve

1: Pneumatic EGR valves are actuated with the aid of electro-pneumatic valves.
2: The air mass sensor is required on diesel engines, among other things for controlling the exhaust gas recirculation.
3: Since the pressure diff erence between exhaust and intake side is inadequate for the high exhaust gas recirculation rates on diesel vehicles, "regulating throttles" are fi tted into the intake manifold to generate the required vacuum.

Tips for troubleshooting

The most common cause for malfunctions in the EGR system are stuck or carbonised EGR valves. Besides gaseous pollutants, recirculated exhaust gas also contains soot particulates, in particular in the case of diesel vehicles. Due to oil in the intake air, carbon deposits or carbon fouling are caused which eventually the force of the valve can no longer cope with ñ the EGR valve can then no longer open, or it remains in its open position. This results in jerking, irregular idling or insuffi cient engine power. The causes of a high portion of oil in the intake or charge air may be malfunctions in the crankcase ventilation, worn bearings, a clogged oil return line on the turbocharger, worn valve stem seals or guides, the use of unsuitable engine oil qualities or an excessive engine oil level. Exceptionnally intense deposits may also be caused by faults in the injection system.

Though EGR valves are designed for the high temperatures in the exhaust branch system, heat damage to the valve may occasionally occur. Such damage can be caused by incorrect actuation, excessively high exhaust gas back pressure or a blow-off valve ("waste-gate valve") of the turbocharger which does not open. There may even be some manipulation ("tuning") to increase the boost pressure. On pneumatic EGR valves, one potential cause of malfunctions can be found in the entire section of vacuum control (vacuum pump, vacuum lines, solenoid valves). Electric EGR valves and solenoid valves can mostly be actuated by way of an actuator diagnosis by the engine tester. The switching of a functioning valve can easily be heard when the engine is at a standstill.

Whenever a new EGR valve is installed after a defect, and the vehicle behaves as if the valve had not have been replaced at all, the map data required for operation must fi rst be "re-learnt". This is achieved either in the course of a longer test drive or by using a specifi c program option in the engine tester, e.g. "Basic settings".

We strongly advise against cleaning the EGR components! If a component really is already defective, no improvement will be achieved by cleaning it. And if functioning components are treated in this way, they may be damaged as a result of cleaning. 

A defective component should always be replaced by a new one.

1: Since EGR valves do not soot themselves, it is essential to search for the causes of soot formation.
2: Salt and dirt may damage the sensor of an air mass sensor – they will at least falsify the measurements, which in turn could aff ect exhaust gas recirculation.
3: Whether dealing with pneumatic EGR valves or an electro-pneumatic pressure transducer, as in this case: The function can easily be tested using a vacuum hand pump.

Troubleshooting in exhaust gas recirculation system:

 Complaint:  Potential causes:  Remedies
 Caused by EGR valve 
  • Irregular idling
  • Jerking
  • Insuffi cient engine power
  • Limp-home operation
  • MIL lights up/error code set
  • Insuffi cient engine power in lower rpm range or in cold run (Otto)
  • Insuffi cient engine power in upper rpm range (diesel) 
  • General: Coked/stuck EGR valve
    • Poor, inadequate combustion
    • Engine management fault
    • Frequent short-distance drives
    • Leaks in vacuum system
  • Check engine controls
  • Check software update of engine control unit
  • Avoid frequent short-distance drives
  • Replace valve
  • Defective solenoid valves
  • Malfunctions in vacuum system
  • Check function, electrical actuation and
     tightness of vacuum system
     See below: "Vacuum system"
  • High oil content in intake or charge air:
    • Malfunctions in crankcase ventilation
    • Engine oil level too high
    • Low-quality engine oil
    • Worn valve stem seal or guides
  • Check oil separator, engine exhaust valve
  • Check pistons, piston rings, cylinders, valve stem seals and/or guides for wear
  • Check turbochargers for clogged oil return line
  • Change of oil and oil filter replacement
     (by professional)
  • Air mass sensor signal/other sensor signal
     defective
  • Check sensors for set-point values,
     replace if necessary
  • P0401 "Flow rate too low"
  • P0103 "Air mass too high"
  • EGR valve does not open or is not actuated
  • EGR system has been shut down (the vehicle no
     longer complies with the ABE!) 
  • Check connectors and actuation
  • P0401 "Flow rate too low" 
  • P0103 "Air mass too high"
  • EGR valve does not close/remains permanently open
  • Uncontrolled, permanent exhaust gas recirculation
  • Replace EGR valve
  • Check connectors and actuation
  • EGR valve has temperature damage, visible discolouration, initial fusing (Otto) 
  • Incorrect actuation
  • Exhaust gas back pressure too high
  • Blow-off valve of turbocharger does not open
  • Replace EGR valve
  • Check actuator of EGR valve
  • Check exhaust gas back pressure
  • Check blow-off valve of turbocharger ("waste-gate") and its actuation
  • New EGR valve, inoperative
  • High idling after installation
  • New EGR valve has not been adapted
  • Conduct a basic setting of EGR valve
     using the engine tester
 Caused by vacuum system/solenoid valves
  • Engine "chattering"
  • Engine misfi res
  • Limp-home operation
  • Decreasing braking performance
  • Defective hoses (porous, damaged by marten bites)
  • Leaking connectors on pneumatic valves
  • Leaking non-return valves/vacuum reservoir
  • Defective/porous diaphragms or seals on pneumatic actuators
  • Leaks in intake manifold 
  • In the event of damage, check the tightness of all components in the vacuum system and replace defective part
 Caused by air mass sensor 
  • P0401 "Flow rate too low"
  • Black smoke
  • Inadequate engine performance
  • Limp-home operation
  • Air mass sensor damaged/dirty due to
    • Dirt particles in intake air
    • Leaks in intake air system, splash water
    • Contamination during air fi lter replacement
    • Clogged air fi lters
    • Oil-moistened sports air fi lters
  • Avoid any intake of water and particles
     into intake air system
  • Damage to turbocharger
  • Check turbocharger

EGR = Exhaust gas recirculation; MIL = Malfunction Indicator Lamp

 

Selection of items

General information

Code:7.00020.24.0
Brand: PIERBURG
Title:EGR Valve
Car:FIAT
Weight  :1,29 kg

Criteria

Valve type: Solenoid Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £129.57 (£129.57 without VAT 0%)
Your price: -40% £77.74 (£77.74 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.00020.25.0
Brand: PIERBURG
Title:EGR Valve
Car:OPEL
Weight  :1,24 kg

Criteria

Valve type: Solenoid Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £140.04 (£140.04 without VAT 0%)
Your price: -40% £84.02 (£84.02 without VAT 0%)
Warehouse: 1 pcs
Supplier: 0 pcs

General information

Code:7.00063.10.0
Brand: PIERBURG
Title:EGR Valve
Car:ALFA ROMEO
Weight  :1,15 kg

Criteria

Valve type: Solenoid Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £134.57 (£134.57 without VAT 0%)
Your price: -40% £80.74 (£80.74 without VAT 0%)
Warehouse: 0 pcs
Supplier: > 25 pcs

General information

Code:7.00075.07.0
Brand: PIERBURG
Title:EGR Valve
Car:RENAULT
Weight  :2,16 kg

Criteria

Valve type: Solenoid Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
Netto price: £229.50 (£229.50 without VAT 0%)
Your price: -40% £137.70 (£137.70 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.00309.07.0
Brand: PIERBURG
Title:EGR Valve
Car:VW
Weight  :0,73 kg

Criteria

Valve type: Diaphragm Valve
Operating Mode: Pneumatic
Supplementary Article/Supplementary Info: with seal
Netto price: £101.46 (£101.46 without VAT 0%)
Your price: -40% £60.88 (£60.88 without VAT 0%)
Warehouse: 3 pcs
Supplier: 0 pcs

General information

Code:7.00365.06.0
Brand: PIERBURG
Title:EGR Valve
Car:ŠKODA-VW
Weight  :0,84 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £204.39 (£204.39 without VAT 0%)
Your price: -40% £122.63 (£122.63 without VAT 0%)
Warehouse: 6 pcs
Supplier: > 25 pcs

General information

Code:7.00368.15.0
Brand: PIERBURG
Title:EGR Valve
Car:RENAULT
Weight  :0,82 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Voltage [V]: 12 V
Netto price: £162.00 (£162.00 without VAT 0%)
Your price: -40% £97.20 (£97.20 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.00450.09.0
Brand: PIERBURG
Title:EGR Valve
Car:BMW
Weight  :0,67 kg

Criteria

Valve type: Diaphragm Valve
Operating Mode: Pneumatic
Netto price: £126.86 (£126.86 without VAT 0%)
Your price: -40% £76.12 (£76.12 without VAT 0%)
Warehouse: 3 pcs
Supplier: > 25 pcs

General information

Code:7.00450.10.0
Brand: PIERBURG
Title:EGR Valve
Car:BMW
Weight  :0,67 kg

Criteria

Valve type: Diaphragm Valve
Operating Mode: Pneumatic
Netto price: £121.82 (£121.82 without VAT 0%)
Your price: -40% £73.09 (£73.09 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.00512.03.0
Brand: PIERBURG
Title:EGR Valve
Car:BMW
Weight  :0,84 kg

Criteria

Valve type: Diaphragm Valve
Operating Mode: Pneumatic
Netto price: £134.75 (£134.75 without VAT 0%)
Your price: -40% £80.85 (£80.85 without VAT 0%)
Warehouse: 1 pcs
Supplier: 13 pcs

General information

Code:7.00555.06.0
Brand: PIERBURG
Title:EGR Valve
Car:Volvo C30 C70 S40 S60 S80 V70 XC60 XC70 XC90 2.4TDI D5244* 01.2001→12.2014
Weight  :1,65 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
General Information: without the electronics unit
Netto price: £308.04 (£308.04 without VAT 0%)
Your price: -40% £184.82 (£184.82 without VAT 0%)
Warehouse: 2 pcs
Supplier: > 25 pcs

General information

Code:7.00555.07.0
Brand: PIERBURG
Title:EGR Valve
Car:Volvo C30 C70 S40 S60 V50 V70 XC70 XC90 2.4TDI D5244* 03.2005→12.2014
Weight  :0,22 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
General Information: electronics unit only
Netto price: £159.93 (£159.93 without VAT 0%)
Your price: -40% £95.96 (£95.96 without VAT 0%)
Warehouse: 3 pcs
Supplier: 0 pcs

General information

Code:7.00578.12.0
Brand: PIERBURG
Title:EGR Valve
Car:CITROEN
Weight  :1,69 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £189.50 (£189.50 without VAT 0%)
Your price: -40% £113.70 (£113.70 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.00684.14.0
Brand: PIERBURG
Title:EGR Valve
Car:BMW
Weight  :0,56 kg

Criteria

Valve type: Diaphragm Valve
Operating Mode: Pneumatic
Supplementary Article/Supplementary Info: with seal
Netto price: £135.21 (£135.21 without VAT 0%)
Your price: -40% £81.13 (£81.13 without VAT 0%)
Warehouse: 2 pcs
Supplier: 0 pcs

General information

Code:7.00789.10.0
Brand: PIERBURG
Title:EGR Valve
Car:AUDI
Weight  :0,80 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
Netto price: £166.57 (£166.57 without VAT 0%)
Your price: -40% £99.94 (£99.94 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.00823.06.0
Brand: PIERBURG
Title:EGR Valve
Car:VW
Weight  :1,35 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £178.89 (£178.89 without VAT 0%)
Your price: -40% £107.33 (£107.33 without VAT 0%)
Warehouse: 4 pcs
Supplier: > 25 pcs

General information

Code:7.00907.03.0
Brand: PIERBURG
Title:EGR Valve
Car:ŠKODA-VW
Weight  :0,80 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £133.50 (£133.50 without VAT 0%)
Your price: -40% £80.10 (£80.10 without VAT 0%)
Warehouse: 23 pcs
Supplier: > 25 pcs

General information

Code:7.01106.38.0
Brand: PIERBURG
Title:Cooler, exhaust gas recirculation
Car:Audi A4/A5/A6/Q5 Porsche Cayenne Volkswagen Touareg 3,0TDI CANA CANB CANC CAND CCLA CCWA CCWB CDYA CDYB CDYC CGKA CGKB 2007+
Weight  :3,93 kg

Criteria

Material: Aluminium
Operating Mode: Electric
Netto price: £503.75 (£503.75 without VAT 0%)
Your price: -40% £302.25 (£302.25 without VAT 0%)
Warehouse: 0 pcs
Supplier: 0 pcs

General information

Code:7.01268.03.0
Brand: PIERBURG
Title:EGR Valve
Car:MAN
Weight  :0,17 kg

Criteria

Valve type: Non-Return Valve
Operating Mode: Pneumatic
Netto price: £153.00 (£153.00 without VAT 0%)
Your price: -40% £91.80 (£91.80 without VAT 0%)
Warehouse: 21 pcs
Supplier: > 25 pcs

General information

Code:7.01599.10.0
Brand: PIERBURG
Title:EGR Valve
Car:Fiat Punto Panda Doblo 500, Opel Astra Corsa Meriva 1,3CDTi 16V 2010+
Weight  :0,79 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Voltage [V]: 12 V
Supplementary Article/Supplementary Info: with seal
Netto price: £128.36 (£128.36 without VAT 0%)
Your price: -40% £77.02 (£77.02 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.01782.07.0
Brand: PIERBURG
Title:EGR Valve
Car:VW
Weight  :1,21 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
Netto price: £181.93 (£181.93 without VAT 0%)
Your price: -40% £109.16 (£109.16 without VAT 0%)
Warehouse: 3 pcs
Supplier: > 25 pcs

General information

Code:7.02014.07.0
Brand: PIERBURG
Title:EGR Valve
Car:NISSAN
Weight  :1,47 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
Netto price: £221.07 (£221.07 without VAT 0%)
Your price: -40% £132.64 (£132.64 without VAT 0%)
Warehouse: 0 pcs
Supplier: 0 pcs

General information

Code:7.02132.07.0
Brand: PIERBURG
Title:EGR Valve
Car:VW Touareg, Audi A4 A5 A6 Q5 Q7 2,7TDI 3,0TDI CATA CASA CASD 2008+
Weight  :0,79 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
Netto price: £167.86 (£167.86 without VAT 0%)
Your price: -40% £100.72 (£100.72 without VAT 0%)
Warehouse: 5 pcs
Supplier: > 25 pcs

General information

Code:7.02209.11.0
Brand: PIERBURG
Title:EGR Valve
Car:FORD
Weight  :0,77 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Info 2: with seal ring
Netto price: £191.11 (£191.11 without VAT 0%)
Your price: -40% £114.67 (£114.67 without VAT 0%)
Warehouse: 7 pcs
Supplier: > 25 pcs

General information

Code:7.02256.37.0
Brand: PIERBURG
Title:Valve, secondary air system
Car:Mercedes Sprinter Viano SLK, Smart
Weight  :0,11 kg

Criteria

Valve type: Switch Valve
Operating Mode: Electric
Voltage [V]: 12 V
Netto price: £21.75 (£21.75 without VAT 0%)
Your price: -40% £13.05 (£13.05 without VAT 0%)
Warehouse: 7 pcs
Supplier: 0 pcs

General information

Code:7.02756.07.0
Brand: PIERBURG
Title:Cooler, exhaust gas recirculation
Car:Volkswagen CaliforniaT5 MultivanT5 TransporterT5 TransporterT6 2,0TDI/2,0BiTDI CFCA* Euro5 2009+
Weight  :6,10 kg

Criteria

Material: Aluminium
Operating Mode: Electric
Voltage [V]: 12 V
Netto price: £660.54 (£660.54 without VAT 0%)
Your price: -40% £396.32 (£396.32 without VAT 0%)
Warehouse: 0 pcs
Supplier: 0 pcs

General information

Code:7.03196.09.0
Brand: PIERBURG
Title:EGR Valve
Car:VW Multivan/Transporter 2.0BiTDI
Weight  :0,78 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
Netto price: £166.57 (£166.57 without VAT 0%)
Your price: -40% £99.94 (£99.94 without VAT 0%)
Warehouse: 1 pcs
Supplier: > 25 pcs

General information

Code:7.03622.06.0
Brand: PIERBURG
Title:Cooler, exhaust gas recirculation
Car:IVECO
Weight  :2,74 kg

Criteria

Material: Aluminium
Supplementary Article/Supplementary Info: with seal
Netto price: £215.46 (£215.46 without VAT 0%)
Your price: -40% £129.28 (£129.28 without VAT 0%)
Warehouse: 0 pcs
Supplier: 2 pcs

General information

Code:7.03784.34.0
Brand: PIERBURG
Title:EGR Valve
Car:FORD
Weight  :1,11 kg

Criteria

Valve type: Control Valve
Operating Mode: Electric
Supplementary Article/Supplementary Info: with seal
Netto price: £145.50 (£145.50 without VAT 0%)
Your price: -40% £87.30 (£87.30 without VAT 0%)
Warehouse: 2 pcs
Supplier: > 25 pcs

General information

Code:7.04879.00.0
Brand: PIERBURG
Title:Thermostat, coolant
Car:OPEL
Weight  :0,27 kg

Criteria

Supplementary Article/Supplementary Info: with seal
General Information: Opening temperature 105C
Netto price: £56.21 (£56.21 without VAT 0%)
Your price: -40% £33.73 (£33.73 without VAT 0%)
Warehouse: 3 pcs
Supplier: > 25 pcs

General information

Code:7.20279.50.0
Brand: PIERBURG
Title:EGR valve
Car:BMW
Weight  :0,37 kg
Your price: £0.00 (£0.00 without VAT 0%)
Warehouse: 0 pcs

General information

Code:7.21826.52.0
Brand: PIERBURG
Title:EGR valve
Car:FORD
Weight  :0,68 kg
Netto price: £145.79 (£145.79 without VAT 0%)
Your price: -85% £21.79 (£21.79 without VAT 0%)
Warehouse: 1 pcs

General information

Code:7.21835.53.0
Brand: PIERBURG
Title:EGR valve
Car:VOLVO
Weight  :0,27 kg
Netto price: £93.57 (£93.57 without VAT 0%)
Your price: -40% £56.14 (£56.14 without VAT 0%)
Warehouse: 0 pcs