Could the EGR valve removal become the next MOT failure?
In February 2014, the Government/ EU made it an automatic MOT failure if a car that had a DPF fitted as standard was found to not have one present. This caused a lot of panic among car owners who had their DPF removed before these new rules came into force.
The reality of this situation has caused those same car owners to think twice about other emissions-related mechanical modifications, most notably EGR valve removal. But we’re here to tell you that you have nothing to worry about with EGR valve removal. It is simply not an MOT failure if you have your EGR valve removed from your car, and it is highly unlikely that the EGR valve will become the next MOT failure.
What is a EGR valve ?
To understand why this is, you need to understand what a EGR valve is. The EGR valve’s purpose is to open and close at certain moments during the rev range. The goal of this process is to reduce nitrogen oxide emissions (NOx). The EGR valve recirculates a portion of the engine’s exhaust gases back to the engine’s cylinders. These gases are used by the engine to burn fuel rather than escape through the exhaust. And thus, the EGR valve plays a role in reducing the level of emissions coming out of a vehicle.
However, the gas re-used by the EGR valve (nitrogen oxide) that would otherwise leave the exhaust is not harmful to humans. It’s non-toxic. This is in stark contrast to the diesel particulate matter or soot that DPFs deal with, which is toxic to humans. EGR valve removal therefore has little to no effect on local air quality and pollution. But having said that, nitrogen oxide is converted in the air to nitrogen dioxide, which is potentially toxic to plants.
Why EGR valve removal is worth it
The fact is this – The EGR valve is not a perfect technology. EGR valves while having the best intentions can get clogged with carbon deposits and fail, leaving the motorist with costly repair bills. A clogged EGR valve will become stuck in an open or closed position and this can lead to irreversible turbo and engine damage. Due to this, many motorists choose to have EGR valve removal. This is perfectly legal. A car will not fail its MOT because it has had an EGR valve removal. And should you wish to have an EGR valve put back into your car, the good news is that it costs very little compared to a DPF. So should EGR valve removal become an MOT failure in the future (which is unlikely), you won’t be faced with a huge bill.
The bottom line
We can’t predict the future, but for now (as of 13/07/2015) EGR valve removal will not lead to MOT failure. We will update this article with any new information as it comes in.