Gasoline particulate filters (GPF) are used to remove particulate matter from the exhaust gas from a gasoline direct injection (GDI) engine. GDI vehicles are becoming more popular due to the regulations to reduce CO2 emission, at the forefront is legislation like Euro 6 and China 6. However, a GDI engine has a higher emission of particulate matter than a port fuel injection gasoline engine. GPF controls the particulate emission by trapping the particulate matter. In the process the filter becomes obstructed and requires cleaning. A pressure sensor can be used to determine the level of obstruction in the filter by measuring the differential pressure across the filter and determine when a cleaning process should be initiated. SMI’s platinum based pressure sensors enable accurate and reliable measurement across the filter while surviving the harsh environment of direct exposure of the exhaust gas.