Exhaust Gas RECIRCULATION

WARNING: This page is about a different car, the 2019 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

There are 2 main external Exhaust Gas Recirculation (EGR) systems that are used on the engine.

High Pressure (HP) EGR
Low Pressure (LP) EGR

EGR is used to cool the combustion in the cylinders by introducing exhaust gases without oxygen. This in turn allows the use of smaller fuel injections, improving emissions and fuel economy.

The following systems are used for specific markets:

EU5 markets - use both HP and LP EGR system. The LP system uses an EGR valve and EGR cooler. The HP system uses an EGR valve and a cooled pipe. The cooled pipe is positioned between the EGR valve and exhaust manifold. A simple pipe connects the EGR valve and intake manifold.
EU6 markets - use both HP and LP EGR valves. Both the LP and HP system uses an EGR cooler.

The valves are controlled by the Powertrain Control Module (PCM).