Autobox in limp mode

2004 td5 auto. Was working fine but after a car wash the auto gear box flashes in 1,2,3 and D. Reverse is OK but the others seem only to work in 3d gear. M and S flashing as well.

What you are describing is the default position adopted by the eat (electronic automatic transmission) ecu when a fault is logged in the eat ecu.
In Rave, the land rover discovery workshop manual, there is a list of about 19 faults which will trigger this default position.
So you need to have your fault codes read by a, test book, nanocom or hawkeye diagnostic tool, other fault code readers may not give a true reading as discovery td5 is not obd2 compliant, using landowners own code system.

Sounds like your XYZ switch innards got wet.
Crawl under your Disco and spray some wd-40 at your XYZ switch to dry it out from water.
If that works then you need to take apart and reseal your XYZ switch so no more water intrusion.

Most likely a bit of water got into XYZ switch, but there are other things that can cause it. Poor battery / power, oil in Ecu etc.

Where are you located? Find someone close by with a code reader

I sustain completely what's said in post #2 ... the rest is a guessing game

Cleaned and dried both Connectors to the autobox. Removed the bottom plate. Cleaned the solenoid. New filter and oil. Still same error. "Pressure regulator" can't get official diagnostics as in Ukraine! Maybe the xzy switch thing? What is it and where do I find it? Thanks for your help and replys people.

As long as the LCD shows you accurately what you select with the lever i doubt it's the XYZ switch but what ever you do if you go just based on guesses it can be more expensive than buying your own diagnostic tool and fix the real fault from the beginning, bite the bullet and buy a Foxwell NT520 Land Rover(the cheapest reliable tool you can get) and it will pay for itself in no time

Like sierraferry stated, definitely get a diagnostic tester. It'll help you immensely when troubleshooting these beasts. The Foxwell is good that I've got one.

Davemj said:

Maybe the xzy switch thing? What is it and where do I find it?.

Click to expand...

It is bolted on the automatic transmission that you can access under your Disco.
The XYZ switch sends an electronic signal when you shift PNRD321.

keeping it simple... check that your battery is charged and the battery connections and wiring (including alternator) are tight.
In my experience, low battery voltage can sometimes trigger the flashing M&S lights fault.

Cleaned the xyz thing. Also under passenger seat there is the big plug. One of the contacts doesn't make a circuit and next to the gearbox is a cable free. Thinking it might have come lose? Got a sparky checking the wires now.

Lose cable from autobox computer to autobox. Rewired and up and runner. Thanks guys