Differential Pressure Sensor for 2.0 CBEA engine in the 2009 Jetta & Sportwagen TDI.
There are two of these sensors in the exhaust system. One is used to measure pressure differential across the DPF, referred to as the G451 sensor. The other is used to measure pressure differential in the low-pressure EGR, referred to as the G450 sensor. Even though there are two sensor codes, G450 and G451 and there are two sensors in the car, they are the same part number and are interchangable.
This sensor is not interchangeable with the "B" sensor.