Q&A with Valeo

5 March 2012  

A customer wants to remove the EGR valve from their vehicle because they are concerned it’s worn out and do not want to purchase a new one. Will there be any issues removing it?

Exhaust Gas Recirculation (EGR) valves are designed to introduce exhaust gases back into the combustion chamber of the engine. This has two effects, reducing NOx emissions from the engine and cooling the cylinder due to oxygen and fuel being offset by the introduction of exhaust (burnt) gas.

The Diesel Particulate Filter (DPF) is used to ensure a vehicle is compliant with Euro 5 emission regulations. This traps unburned hydrocarbons (soot) from the engine and stores them, helping to reduce exhaust emissions, which especially occur, in built-up areas. The soot is only burnt off when high engine speeds are maintained over an extended period. When the DPF is full, it either needs replacing or the soot is burnt off by introducing heat into the filter.