How do you turn off engine management light on your discovery td4?

To turn off the engine management light on a Discovery TD4, first, you need to diagnose the underlying issue using an OBD-II scanner to read the fault codes. Address any necessary repairs based on the codes retrieved. After resolving the issue, you can reset the engine management light using the scanner or by disconnecting the battery for a few minutes. If the problem persists, it may indicate a more serious issue that requires professional attention.