Ok make sure nissan does a master reset on the ecu as if they were to put a new dpf in there and reset it.. That's the only way I got mine working again.. Don't be alarmed if it won't come out of limp first time they had to do it 2 to 3 times on mine then it finally came out of it. Now, in order to keep the dpf from doing a regen cycle again you will need to get a bung made up for the O2 sensor with a 3mm hole at the end of it so it reads less co2 then the one at the front of the dpf.. You should be good for a while without it because the stupid ecu will think that it's not blocked but defiantly worth it.