Ive just found the following on a friends A4 2008 3l v6 quattro
VCDS Version: Beta 12.10.1
Data version: 20121121
5162 - Diesel Particle Filter; Differential Pressure Sensor
P2453 00  - Implausible Signal
MIL ON - Confirmed - Tested Since Memory Clear
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 131863 km
Now googling around suggests this sensor needs calibrating/adapting when replacing, what is the process for doing this?
Ive checked the soot level and it was around 14g, but with a dodgy sensor that might not be accurate. The car doesnt seem down on power, the engine light and coil light come on shortly after resetting though.
Engine was recently replaced with a second hand unit (sucked up water), if the replacement engine had a g450 on it, would this need calibrating to the cars ecu? In effect if this happened, could putting the original sensor back on fix it?