How to Clean EGR Valve and Throttle Body | Fiat Ducato 2.5LT. Turbo Diesel Engine | Full Tutorial.

In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide emissions reduction technique used in petrol/gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver accelerator pedal input in the main.