When you want to replace an EGR valve, it's best to use an original equipment manufacturer (OEM) replacement. Most aftermarket parts are built to the same standards as OEM, but there are exceptions.
When you need to replace an EGR valve, there's really no reason and potentially a lot of risk to using aftermarket parts. Most aftermarket car parts are built to the same standards as OEM, but there are exceptions. A bad EGR valve can cause issues with your car's emissions and performance.
When you're looking for car parts online, chances are you’re going to run into both OEM (original equipment manufacturer) and aftermarket options. Both have their pros and cons, but for many people, OEM is the better option because it guarantees that the component will match everything else in your vehicle.