Close up detail of car engine

EGR Valves: What They Do, Why They Fail, and What You Can Do

Many modern automobiles rely on an orchestra of components and systems to drive and operate as smoothly, comfortably, and efficiently as they’re expected to.

Whether it’s a minivan, SUV, sedan, sports car, or hatchback, it’s best to assume that your ride relies on different things to ensure that it runs smoothly. From pistons and valves to fuses and CO2 sensors, each component needed to get a car started and moving cannot be overlooked, which means that it’s crucial to know everything to some extent. 

Among the different components that you should familiarise yourself with, the engine gas recirculation (EGR) valves are the components that you’ve probably never heard of. However, the degree of unfamiliarity surrounding the part in question doesn’t take away from the fact that it’s still a fairly vital component! 

What Are EGR Valves?

To best understand what exactly an EGR valve does for your car, let’s first get its technical definition out of the way. These components are responsible for ensuring that a car runs more efficiently and completely burns fuel by recirculating a portion of your exhaust emissions. After the said recirculation takes place, the resulting emissions are run through the combustion process again until it ensures a more complete burn of fuel.

Through the process mentioned above, engine gas recirculation valves help ensure that your car has a more efficient experience with decreasing its noxious emissions. Over the past few decades, manufacturers have been able to ensure that vehicles can prohibit the release of some harmful gasses via the exhaust pipes, leading to better emissions.

How Can They Fail?

Although they’re built well in a much more airtight fashion compared to other components, EGR valves aren’t immune to the possibility of failure. Essentially, this is an outcome that can lead to serious problems with performance.

In terms of mechanical technicalities, this particular technology is designed to open and close electronically at certain times throughout a car’s rep range or power band. Over time, however, these same components can become clogged up with carbon deposits, leading to failure and sticking on opening or closing. 

What Are Signs of a Malfunctioning EGR Valve?

When it comes to identifying whether your car is experiencing a malfunction in its engine gas recirculation valve, there are certain signs and symptoms that you need to watch out for. Although each engine is different in terms of how it reacts to the problem in question, here are a few common experiences to spot:

  • Poor idling speed
  • Loss of power
  • Knocking
  • Unresponsiveness
  • Black smoke coming from the exhaust pipe
  • Illuminated engine management light

How Do You Solve the Problem in Question?

When it comes to experiencing EGR valve failure, the biggest danger that drivers need to watch out for is that it’s a problem that appears arbitrarily—which means it’s best to have it removed.

The best way to handle such a problem is by remapping your car’s ECU and deleting the EGR valve from its assembly. Through the service of a professional like Carlton Tuning, you’ll be able to help ensure that your car’s engine runs a lot better because: 

  • You will get to avoid a delay in detonation—translating to a faster spark 
  • You can have an easier time ensuring that your vehicle remains as reliable as possible
  • You won’t need to worry about fault codes like P0400, P0401, and P0402 that can come up at inopportune times


Although an engine gas recirculation valve is helpful in terms of ensuring that your car’s emissions remain clean, it is capable of causing various issues that can serve as an impediment to its performance. With the help of a delete and remap, you can avoid having any problems associated with EGR malfunctions occur at the worst possible times!

Taking your car’s performance to the next level has never been easier, thanks to our ECU remap service in Barnsley, South Yorkshire. If you want to leave your beloved ride with a team of experts that can professionally handle your needs, look no further because we’ve got you covered, so schedule an appointment with us today!

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