I understand the fault may lie with a wiring connection that is under the auto transmission shift lever and accessed from under the vehicle. Mine is used in sand etc but I would doubt it has ever been wet under there apart from very rarely after rain. Please can someone advise what I am looking for in terms of fault finding. With the M+S lights on the vehicle drives as though the clutch is slipping

Many thanks

Firstly check the battery voltage. Low battery power can promt the M and S lights to flash and cause the problem. Discovery 2's need a lot of electrickery
Its also possible that the gearbox needs a fluid and filter change
It can also be the switch on the autobox selector.

Thanks for that the battery is fairly new and the right size but I will get it checked first
I think the fluid and filter is a good call as they have not been changed for about 9 months - is this a DIY job?
I shall let you know how I get on with these two jobs first
Many thanks

Jagman
I found this in the Disco pdf manual which sounds like drop the sump off remove and clean the filter (not replace disposable element) and refit, fill with transmission fluid - do you agree this sounds right

AUTOMATIC GEARBOX - ZF4HP22 - 24

Filter - oil

Remove
1. Remove oil sump gasket.
2. Remove Torx screw securing oil pick-up tube
and remove tube.
3. Remove 2 Torx screws securing filter to valve
body and discard 'O' rings.
Refit
1. Clean filter and pick-up tube using a lint free
cloth.
2. Fit new 'O' rings to filter.
3. Position filter and tighten Torx screws to 8 Nm
(6 lbf.ft).
4. Position oil pick-up tube and tighten Torx
screw to 8 Nm (6 lbf.ft).
5. Fit oil sump gasket.

Golf One One is a 'disco' guru, he also has a lot of friends with mechanical quals/minds. Give him a shout via PM.

There's a guy on net. Discovery 2.co.uk. He's a machine at the disco 2. Step by step fixes for all disco 2 faults. Ie. 3 amigos,sunroofs, egr.
Take a look. Might help you out mate

Originally Posted by muscat_diver

Jagman
I found this in the Disco pdf manual which sounds like drop the sump off remove and clean the filter (not replace disposable element) and refit, fill with transmission fluid - do you agree this sounds right

AUTOMATIC GEARBOX - ZF4HP22 - 24

Filter - oil

Remove
1. Remove oil sump gasket.
2. Remove Torx screw securing oil pick-up tube
and remove tube.
3. Remove 2 Torx screws securing filter to valve
body and discard 'O' rings.
Refit
1. Clean filter and pick-up tube using a lint free
cloth.
2. Fit new 'O' rings to filter.
3. Position filter and tighten Torx screws to 8 Nm
(6 lbf.ft).
4. Position oil pick-up tube and tighten Torx
screw to 8 Nm (6 lbf.ft).
5. Fit oil sump gasket.

It does have an internal filter, its a flat, metal filter that can be changed. It makes a big difference to the gearbox. Going by your user name you live somewhere pretty hot? Its not uncommon for the filters to never be changed.
I'm also sorta assuming its a V8?

Assuming is a 4 litre Discovery 2 it will be a ZF4HP 24 rather than the earlier 22. Much the same gearbox but improved internals.
The transmission fluid will breakdown with heat and an autobox generates an awfdul lot of heat. Fluid and filter change is easy enough to do but you must keep everything internal very very clean. Any dirt ingress will wreak havoc with your box!

As to the battery, its pretty common to have the wrong battery, my TD5 requires a battery of about 110ah but if you got to a mainstream auto chain they will flog you something around 90ah that isn't man enough.
There are a lot of electical systems on a Discovery 2 and a small battery just won't hack it. Check the electrolyte levels on the battery too.

The good news is that the ZF4HP has been around a long time and they are a pretty tough gearbox

workshop manuals here-
pdf Land Rover Manuals | Landroverweb.com

Many thanks blobmeister and Bigcsm22, I shall follow up with Golf one one and check out Discovery 2.co.uk. I want to learn what the common faults are and how to fix them as taking the vehicle to the other side of town and leaving it for a couple of days each time is a pain in the backside, especially if I need the car for work / collect kids. Its also useful to be able to fix these things if out on a trip
Cheers

You will find every common fault and fixes on the website. You will not be disappointed. I use the website to repair mine. I knew nothing about them. Now I can figure out most things. Good luck. Great car

Is it the V8 model?

Does it make any difference whether or not you are in High Range or Low range?