I just bought a 2000 disco 2 and it had the three amigo lights on and the check engine light. I ran all the ABS and engine codes and this is what I got
Abs codes:
1. Front right sensor signal erratic
2. Shuttle valve switch electrical failure
3. Rear right outlet valve open circuit
4. Rear right inlet valve short to internal supply

Obd codes
1. P1590
2. P1171
3. P1174

So far from what I can tell I might have a bad wheel speed sensor, and the shuttle valve will need to be replaced but I'm not really sure about the inlet and outlet valves? Any advice on how I should go about fixing everything?

 

p1590 is a "rough road signal implausible" error. there are a number of causes but a faulty wheel sensor can make it come up.

p1174 and p1171 are codes for the fuel mixture being too lean on both banks of the engine. could be caused by a vacuum leak.

to deal with the abs codes, replace the relevant wheel sensor. you will also need to tear down and clean the abs pump module. just replacing the shuttle switch probably won't work since it's throwing valve codes as well, which probably indicates that the valves aren't functioning correctly.

 

So you think cleaning the valves and replacing the shuttle switch along with the wheel sensor should do it? I just wanted to make sure I don't have to replace the pump

 

i don't know for sure. i do know that just replacing the shuttle switch (or doing "option b") won't be enough if you also have valve problems.
the valves may be serviceable, or other parts internal to the abs block may be replaceable. i have a spare one in my workshop but i haven't started digging into it yet to work that out. there are some guides online that tell you more about the various components.

 

Here is a great read on the Disco's ABS repair...
https://landroverclubvi.weebly.com/abs-mod.html