The EGR valve is typically found on or near the intake manifold or exhaust manifold, but the exact spot varies by engine design. There’s no single universal location, as makers place it where exhaust gas can be recycled back into the intake most efficiently.
Gasoline engines: common locations
The following spots cover the most common locations you’ll encounter on gasoline-powered cars.
- Intake-manifold mounted EGR valve, usually near the throttle body on the intake side.
- Exhaust-manifold mounted EGR valve with a metal or tube connection to the intake via an EGR passage.
- Integrated into the throttle body or mounted directly on the throttle-body assembly in some modern engines.
- On top of the cylinder head or near the firewall in a few designs (location varies by manufacturer).
Locating the EGR valve on gasoline engines typically involves looking for a metal pipe or hose routing exhaust gas back into the intake. If you can’t locate it, consult the vehicle’s service manual or a repair diagram for your exact model.
Diesel engines: typical locations
Diesel engines place the EGR valve in several standard spots, often close to the turbocharger and EGR cooler assembly.
- On or near the exhaust manifold or turbocharger with a dedicated EGR pipe or passage to the intake side.
- Mounted on the cylinder head or near the valve cover area, depending on design.
- Integrated with the EGR cooler assembly in newer diesels, sometimes appearing as a combined valve/cooler unit.
Diesel EGR systems are commonly routed through an exhaust gas cooler, and the valve can be located near the turbo or on the engine’s side, depending on the manufacturer and emission strategy. For exact placement, check the factory diagrams for your engine.
Summary
In short, there is no single universal location for the EGR valve. It is usually found on or near the intake manifold or the exhaust manifold, and many modern engines place it in or near the throttle body or integrated into the cylinder head. Diesel engines commonly locate it near the exhaust path and cooler. Always refer to the vehicle’s service manual or a wiring/diagram schematic for your specific model to pinpoint the exact location.