My 98 Discovery just past 80000 miliage and the service light came on. I change the spark plugs, spark plugs wires, oil, oil filter, air filter, O2 sensor and the light is still on. Does anyone knows how to make the light goes off? I even try disconnect the batteries and that didn't work. Any suggestions?

Thanks in advance.

 

The only way to turn off the check engine light on your D1 with OBD2 is with a good scanner.
Did you change all your O2 sensors, how about your fuel filter, pretty important cause they plug alot.
Mike

 

somebody did a post on turning off service engine light with a paper clip.
reset relay under pass side kick panel below dash.
red relay I believe

 

Well if the Service engine light on the top right of the instrument cluster comes on and you are good about doing your scheduled maintainence then just remove the relay on the kick panel as mentioned above and the light will go for ever. If it is your amber check engine light then you need to use a scanner as mentioned earlier. Hope this helps.

 

in the passenger side kick panel looking about where the hood release would be on the drivers side is a relay brown double wide take it out and through it away it is the service interval timer =worthless