Could anyone advise on the OBDII device required to diagnose a 1995 - 96 Discover V8. There are numerous options available, but normally there is usually one that is preferred as the best option. I have an intermittent cutout fault with the Vehicle Speed Sensor circuit. I've had variant local advice, some saying a scanner will identify the fault, others advising the contrary. Many thanks.

 

95 isn't OBD2 truck,
FaultMate is going to be the most advanced unit you can readily buy, get your wallet ready.

 

I'm getting conflicting advice, some say the D1 has a limited OBD2 diagnostic facility, some say not. How do you identify whether or whether not?

 

nzajg.... I always forget that you have a 1995 and therefore give you advice that doesn't apply. Your truck will not have OBDII capabilities. Sorry if I was the source of confusion.

 

OBD2 port, bottom of the dash infront of the accelerator pedal.

95 trucks run a Lucas system, Faultmate can still read it, but not do a whole lot. Rovergauge I believe is the software that lets you modify it a bit more.
You connect to the 5pin lucas connector for this. Faultmate would just need a different license to do that, as well as the right connectors.

I believe you can also install the diagnostic display under the seat, and get some codes from that. Pretty cheaply, I have one for sale.

 

Maybe this will help clarify the question. My 96 GEMS engine uses OBD2. I think this was the first year for Land Rover OBD2, as all new automobiles sold in the USA required it that year, but some brands had it sooner. I use an OBDLink LX bluetooth adapter, and pair it with Torque software I run on a Samsung tablet. My last update with Torque cost all of five dollars. It shows everything, real time fuel trims, O2 signals, etc. I can wander around the truck while its on. I bought the OBDLink device after using a cheap $10 ebay unit for a few years. I have not really noticed any difference in function, but the OBDLink device has been a bit easier to use, with legitimate corporate backing, so it cost more.
My 94 runs a Lucas system that produces two digit codes on a module under the passenger seat if the Check Engine Light is activated. At some point, if I need to check sensors, I'll be using a multimeter. OBD2 is way better. This truck also has a diagnostic connector for TestBook behind the RH side foot panel, but that was for dealer service only, I think.

Hope this helps.