The Vauxhall Vivaro is a common corporate-style van, used mostly in Great Britain and other European countries. The Vivaro engine includes an EGR, or exhaust gas recirculation, valve near the firewall on the driver's side of the engine compartment that is designed to send burnt exhaust fumes back through the engine to be burnt a second time. This reduces the exhaust fumes expelled from the vehicle. You must remove the engine cover to locate the EGR valve.
Unfasten the Torx bolts that secure the plastic engine cover to the top of the motor with a Torx wrench and set the cover aside.
Locate the master brake cylinder on the driver's side of the engine attached to the firewall. The master brake cylinder is a plastic reservoir with brake fluid inside the container.
Look between the master brake cylinder and the driver's side of the vehicle frame. The EGR valve for the Vivaro engine is a metal black cylinder that sits next to the master cylinder and is connected to an exhaust pipe.
To avoid burns, always let the Vivaro engine cool down before replacing the EGR valve.