G450 and G505 fitted on same car question.

Hi all

I have a Audi A4 2014 engine code CNHC model 8K2EZC transmission PJH
I have 2 exhaust pressure sensors fitted to this car fitted next to each other and have same part number. One is a G450 and the other is G505 (which I believe is the one for the DPF soot measurement)
What is the reason for the 2 sensors and what is the G450 for? Without removing cocers at the moment I can't see were the pipes go to.

G450 is the exhaust pressure sensor
G505 is the DPF differential pressure sensor (differential pressure between before and after the filter element)

iichel said:

G450 is the exhaust pressure sensor
G505 is the DPF differential pressure sensor (differential pressure between before and after the filter element)

Click to expand...

Thanks for the reply anyway, but I already knew what the G505 was, I wanted to know what/why was the G450 for. Also on this one it doesn't measure before and after, just measures before. The other hose from the sensor is only 2 inches long, so looking at atmospheric pressure.
I found out that G450 is for the low pressure EGR system.

I say, it depends what car or Controller Module it is.
There are also G450 that measure differential.