Exhaust gas recirculation serves to reduce emissions of nitrogen oxides (NOx). In diesel engines, exhaust gas recirculation is one of the most important elements for reducing nitrogen oxide emissions.

The higher the combustion temperature, the greater the formation of nitrogen oxides. If exhaust gas is added to the intake air, the concentration of oxygen molecules in the mixture decreases. This means less fuel is injected to completely burn the mixture. The supply of exhaust gas changes the energy, reaction rate and temperature of the combustion. As a result, less nitrogen oxides are formed. An additional exhaust gas cooling increases this effect.

There is internal and external exhaust gas recirculation. Removing the exhaust gas recirculation primarily concerns the external version. Here the exhaust gas is taken from the exhaust tract and fed back to the intake tract via a pipe, a cooler and a valve. This recirculation leads to increased soot formation. Even with increasing engine load, more soot is produced. Over time, the reinforced soot particles clog up the exhaust gas recirculation valve and the diesel particulate filter.

The use of exhaust gas recirculation in diesel engines generally leads to a conflict. On the one hand, the nitrogen oxides are to be reduced, and on the other the soot particles. The technique must be balanced so that this conflict can be resolved.

The problem with exhaust gas recirculation is usually the increased soot accumulation. This leads to a defective exhaust gas recirculation valve. This in turn results in poor throttle response and significant loss of power. This can also result in increased consumption. Increased maintenance and repair costs are the result.

Our EGR delete service removes the EGR system from the vehicle's engine control unit. After removal, the vehicle drives like a system with EGR, without error messages and without the engine indicator light lighting up.

Deactivation of the EGR system is intended exclusively for use off public roads. Report any changes to the competent authorities. Comply with the laws in your country.