You can read the codes yourself at home with nothing more than a paperclip, some simple adding up and a cup of tea (optional)
There will be a 16 pin plug underneath the fusebox located underneath the steering wheel near the drivers right leg. If you bridge the first pin on the bottom row with the last pin on the bottom row and switch the ignition on you'll see that the MIL light or (malfunction indication light) will start blinking at you.
You will see a series of long flashes and short flashes, a long flash is 10 and a short flash is 1, so for example when I had a problem with my Injection pump on my 2.7 I kept getting code 21 which was 2 long flashes and 1 short, the truck will cycle through the codes until you remove the paperclip.
You can check what the codes relate to here;
http://www.nissan4x4ownersclub.com/d...kshop/wk29.pdf
This will give you as much info as your local garages fancy £500 Snap On reader
Guys, who was it that was sorting the workshop manuals page out as I still can't gt to them?