How does an EGR Valve work?
The EGR valve (Exhaust Gas Recirculation) is a mandatory engine part of all diesel and some petrol vehicles. It limits gas emissions, which are harmful for people and for the environment by recirculating a portion of the exhaust gases from the engine back into the combustion process.
Thus NOx, composed of nitric acid and nitrogen dioxide, are partially burnt in your engine when it is at low-load and running at an engine speed that varies according to vehicle brands. Of course, this has consequences on the engine clogging and on the EGR valve.
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How and why does an EGR valve get clogged?
On the other hand, with an open valve, you will strongly damage your air intake system and cause other failures which can be very expensive to replace.
Blocking or removing the EGR valve is prohibited by the law and you will surely be refused at the technical inspection. It is important to sometimes clean your EGR valve to avoid its replacement.