Unusual problem that I hope someone can give me some advice
Just had the Haldex unit cleaned, and new oil put in and now I no longer get a transmission fault warning when engaging the mud/snow mode
BUT!
Now I get an amber engine warning when I disengage the mud/snow mode and the engine runs rough in limp home mode
I can clear this by using the tip to reset the service interval and the engine light goes and the car runs fine
So, what's up and what can I do?

Check the haldex module electrical plugs are fitted proply then try a hard re set if all fails get a diagnostic reader plugged in? 2013 FL2 XS.
Defender 90 300 TDi.
Defender 90 300 TDi CSW.
1964 MGB Roadster.
1944 Willys MB "Jeep" with bullet holes. (gone)
17 hand Irish Drought Thoroughbred (mostly lame)
Nagging Old Boiler.