Sensor - EGR Back Pressure: Description
WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
The EGR back pressure sensor is located in the exhaust stream next to the EGR valve. The sensor determines the exhaust pressure before the catalytic converter. The ECM uses the EGR back pressure sensor for engine protection and exhaust gas turbocharger protection.