How does the EGR valve (exhaust gas recirculation valve) work? It is a part of the car that serves to recirculate part of the blown exhaust gas back into the engine. This reduces the amount of nitrogen oxide (NOx) released into the atmosphere. Today, the EGR valve is used not only by diesel engines, but also by gasoline engines.
At idle, the EGR valve is usually open up to 90%. Only when torque and power needs to be increased does the valve close to allow more oxygen into the cylinder.
Common causes of EGR valve failures:
- Valve clogging dirt, deposits or corrosion, which can cause loss of performance or error messages.
- Mechanical damage to the valvewhich can lead to its complete failure.
- Problems with the control unit valve or with cables that may cause the valve to not respond to signals from the control unit.
Manifestations of a malfunctioning EGR valve:
- Increased fuel consumption: If the EGR valve is malfunctioning, the engine may use more fuel because it is not getting enough air for proper combustion.
- Increased emissions: If the EGR valve is malfunctioning, emissions can be high because not enough air is getting in for proper combustion.
- Increased pressure in the engine: If the EGR valve is clogged, it can cause increased pressure in the engine and can lead to damage to other engine components.
- Error codes: Error messages may appear that indicate a problem with the EGR valve or related components.
- Imperfect engine operation: A malfunctioning EGR valve can lead to irregular engine running, loss of power and higher noise levels.
- Startup problems
Stuck in open/closed position:
Stuck in closed position: The EGR valve is stuck and refuses to open. Nitrous oxide emissions will increase. May cause engine knocking.
Stuck in open position: A bigger problem. You probably won’t even start. If so, the manifestation will be rough running, white smoke from the exhaust and a tendency to “squeal”.
EGR valve price:
The price of the EGR valves themselves varies depending on the type of car and the specific model, they can also vary depending on the place of purchase and service.
- Volkswagen: approx. 3000-5000 CZK
- Audi: approx. 3500-7000 CZK
- BMW: approx. 3000-6000 CZK
- Ford: approx. 2000-4000 CZK
- Renault: approx. 2000-5000 CZK
- Trucks: approx. 3000-4000 CZK
So the EGR valve is a relatively affordable part, but there are also unpleasant exceptions. For example, for a Ford Mondeo 1.8 TDCi manufactured in 2007-2014, a new EGR valve will cost about 14,000 CZK. It is particularly large and electronic.
For luxury cars prices exceeding 20 to 30 thousand crowns are no exception. In addition, for many vehicles, these systems do not work repeatedly and owners change them almost like consumables.
EGR valve replacement cost
On some cars, replacing the EGR valve can be relatively simple and can be done with a minimum of tools. For others, it may require special tools and knowledge. In any case, we recommend consulting an expert.
On older diesel engines the EGR valve is usually located on top and is easily accessible. For such cars, it is about 2 hours of work, which means approx. 1000-1500 CZK per job v service.
However, on newer diesel cars, the EGR valve may be located deeper in the engine and may require the removal of additional components for access.
EGR is also part of many modern gasoline engines. It happens with those valve replacement more complicatedas it may be located deep in the engine and replacement may require disassembly of other components.
Do-it-yourself EGR replacement
1. Disconnect the negative battery cable to prevent damage to the vehicle’s electronic systems or electric shock.
2. Locate the EGR valve in the engine compartment. The EGR valve is usually located on the injector or at the bottom of the engine. May vary by car type and engine.
3. Release the hoses and electrical connections that are attached to the valve. These hoses are usually connected to the injector and the recirculation pipe. Electrical connections are connected to the valve to be controlled by the engine control unit.
4. Use a screwdriver or wrench to remove the valve from its holder. Make sure the valve is loose and can be removed easily.
5. Install the new valve and check that all hoses and electrical connections are properly connected. Make sure the valve is securely attached and all connections are tight.
6. Finally, check that all bolts and nuts are tight and reconnect the negative battery cable. Make sure the battery is connected correctly and that the cable is not damaged.
It is important to follow the manufacturer’s instructions for the specific model and type of car. If in doubt or unsure, I recommend leaving the repair to a professional.
How and with what to clean the EGR valve?
Chemical cleaners: In spray or liquid form. It is important to follow the instructions for use, otherwise they can damage not only the plastic and rubber parts of the EGR valve.
Steam cleaner: These cleaners use hot steam to remove deposits and dirt. They are sold in both home and professional versions.
Ultrasonic bath: The mechanical (not electronic) parts of the EGR valve can be cleaned in an ultrasonic cleaner. This is a gentle and effective way.
Mechanical cleaning: Hand or electric brushes.
How to prevent EGR valve failures:
- Change the engine oil regularly to prevent deposits and valve clogging.
- Regularly inspect and clean the EGR valve to prevent clogging with dirt and deposits.
- Use quality fuel to reduce the risk of engine deposits.
- Check and change the air filter regularly to ensure sufficient air for the EGR valve to function properly.
- Use genuine parts or parts from trusted manufacturers to ensure proper operation of the EGR valve.
- Do not use the wrong lubricating oils, which could affect the operation of the EGR valve.
- Try to drive in economy mode to reduce the load on the engine.
- Use quality diagnostics to detect and repair any problems with the EGR valve in time.
Blinding of the EGR valve
Many owners solve problems with the EGR valve by completely blinding it. Especially with older diesels, this can result in more power and lower fuel consumption.
However, this procedure is illegal and cannot be performed on all engines. For some, the blinding of the EGR valve, on the other hand, leads to lower combustion efficiency and other problems.
Frequently asked questions (and answers) about EGR valves
What is an EGR valve and what is it for? The EGR valve (exhaust gas recirculation valve) is a part of the car that is used to recirculate part of the exhaust gases back into the engine. This reduces the amount of nitrogen oxide (NOx) released into the atmosphere.
What are the most common EGR valve malfunctions? The most common EGR valve malfunctions include dirt or sediment clogging the valve, mechanical damage to the valve, and problems with the valve control unit or wiring.
How can I prevent EGR valve failures? To prevent EGR valve malfunctions, it is recommended to regularly check and clean the valve (if possible). It is also important to regularly change the oil and filters in the engine. And use quality fuel. Overall, keep the car in good technical condition.
How much does an EGR valve repair cost? The cost of EGR valve repair may vary depending on the type of car and the location of the repair. It generally ranges from 1,500 to 8,000 CZK. But it can also be much more expensive.
How do I know I have problems with the EGR valve? You may notice a loss of power, increased consumption, error messages or erratic engine running.
Can EGR valve failure cause engine damage? Yes, EGR valve failure can cause damage to the engine such as corrosion or dirt deposits in the engine. These damages can lead to further malfunctions or even engine damage.
What is the lifespan of the EGR valve? The lifespan of the EGR valve varies depending on the type of car and how often the valve is cleaned and inspected. It is generally around 100,000 – 150,000 km or 5-7 years.
Is it necessary to change the EGR valve at every service inspection? It is not necessary to change the EGR valve at every service visit, but it is recommended to check and clean it regularly to prevent malfunctions or damage to the engine.
What is the effect of EGR valve failure on fuel consumption? A failure of the EGR valve can cause an increase in fuel consumption because the engine must run at a higher temperature or at a lower power.
Are there any ways to fix the EGR valve without replacing it? Some EGR valve malfunctions can be repaired by cleaning the valve, but in case of mechanical damage or failure of electrical components, it must be replaced.
A bit of history
The EGR valve (exhaust gas recirculation valve) began to be used in cars as early as the 1970s. The aim was to reduce the amount of nitrogen oxide emitted from car engines into the atmosphere. The first cars with EGR valves were produced in the USA and Europe. They are now a common and mandatory part of most cars.
