Join Date: Feb 2011
Location: Mansfield UK
Car: 2 Rover 25 Diesels and Rover 45 Mk2 diesel
I am not certain. On my car (2005 model) it goes out it self, but not sure if it takes a certain amount of time to clear. The problem is I just ignore it, initially when it first came on I noticed the EGR vacuum pipe was off the actuator so I put it back on an reset using my SP ACR4. The pipe came off again and the lamp came back on, I refitted the pipe and left the lamp on, but my wife drives the car most of the time and when I went to drive it I noticed the lamp had gone off by itself. I don't know why and when it goes off, but it does. I can say for sure it can be turned off using an ACR4 and if the fault is cleared it will eventually go off by it self on my car.
The EML on early 25 diesels will never go out until reset, it represented a serious engine management fault, such as TPS or fuel pump malfunction. The same is true on the exclamation mark lower EML on 45s if a fault occurs that brings that on. If the fault is clear, when the ignition is turned on, the lower lamp will come on, go out for about a second and then come on again and then stay on. If the fault has not cleared, it will come on when the ignition is turned on and remain on, it will not go out for the 1 second interval. The upper EML seems to be related to emission control faults such as MAF or EGR problems and is less serious.