The Keurig 2.0 needle maintenance is performed when the system is not as effective as it once was. What happens with time is that the Keurig system needle accumulates debris and detritus from brewing. We now turn our attention to the entry needle in the Keurig. This is accessed from underneath the top of the head or handle unit. As you can see from the picture this is quite a sharp protrusion and so do be careful. There are two holes in the needle, on the sides, and these are the parts that need to be cleaned. Update: June 21 2013.
the failed pressure sensor will have a small hose going into it from the side of the board as shown in the picture ( the black circle on the right).
there will be 4 screws at the top of the rest of the keurig to remove the 'head' take pictures of any cables and wires disconnected for reference.
the sensor that failed is a pressure sensor, model FPN-15PG as shown in the pictures.
to check the sensor you have to check the output voltage.
using the second picture showing the model number of the sensor check the voltage on pin (6) which is the pin at the top right of the sensor to the right of the little notch in the top middle of the sensor.
the voltage I believe should be under 1v, mine was at 4.94v (bad)
if you determine that your sensor is bad then just cut that prong.
RECOMMED REPLACEMENT OF SENSOR
sorry that this isn't a great instractable, I wasn't planning on making one so I don't have step specific pictures, however I wasn't able to find any info on how to do this or what causes the error message so here I am providing a little info.