Take you logbook and 2 forms of id to your local rover dealer they normally charge £20 for this service then they will give you a four digit code this has to be entered via the door lock so it can overide the imobiliser
Check your 'tank' ya think. R
If your battery has been disconnected and your key fob will now not work to cancel the imobiliser try this, Open the key fob cover and carefully remove the larger of the two battries give it a wipe for good measure and then replace into its slot, go and sit in your car with doors closed and then press the open and close buttons alternately about four times, the doors will lock just press the open button and your imobiliser is imobilized and you can now start your car. It works for me every time.
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The 1995 Land Rover Discovery has a timing chain.
What I did was get a new ECU that had the Imobiliser removed, perhaps not so secure but they are known to be trouble. Cost about £80. Had no problems since.
hoe do you reset the check engine light in a 1995 land rover
1995 Discovery = 2 720 kg
reprogram ecm.
wher is location of imobiliser
Last time I did it was with a cutting torch.