If you are talking about the service engine light you have to use a handheld scanner to identify the problem. After fixing the problem you use your scanner to erase any codes stored in the ecu in order for your light to go off.
hoe do you reset the check engine light in a 1995 land rover
You can reset the oil light in your 1995 Range Rover Discovery by scrolling to the oil life display. Hold the scroll button in until the oil life goes to 100 percent.
Hold the reset button
You can reset the check engine light, on your 1998 Land Rover, by repairing what ever is causing the light to stay on. You can determine the cause by using a diagnostic tester.
Unfortunately it can only be reset via computer. You also may try turning your key off then on again
Inside panel passenger side under dash by door.
to reset you have to press the button that says doodlebops
you have to take to a rover dealer to put out the service light
iT WILL RESET WHEN THE PROBLEM IS REPAIRED.
range rover supercharge service light off
reset service engine light
You need what is called a "Service indicator reset dongle" it is a very small computer that does all the programming for you. Your local Land Rover Dealer will have one and I'm sure they will be happy to help you, normally without charging you too.