Exhaust Gas Recirculation (EGR) valve is a critical part of modern diesel and gasoline engines since it regulates emissions and reduces nitrogen oxides (NOx).

Replacing EGR coolers isn’t cheap. We talked to a number of diesel repair shops and found prices vary from around $500 for the least-expensive removal and replacement to more than $1,600 ...

Does Removing the EGR Increase Power? Is removing the EGR (exhaust ...

The Cummins engine is well-known due to its power and reliability, but when did it start using an EGR? Here's what it is and what exactly it does.