There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool.
i have replaced the plugs and wires and my service engine light comes again in 2004 land rover discovery
service engion soon light is on
That is one of many possible causes.
The service engine light is the same thing as a check engine light.
well it needs to be serviced...soon
To reset the service light on a Discovery 3 TDV6, first, turn the ignition to the "ON" position without starting the engine. Press the accelerator pedal fully three times within ten seconds. After that, turn the ignition off and then back on. The service light should now be reset.
The service engine soon light comes on when the engine computer has detected a malfunction and set a code. You need to have the system checked for codes to know possible causes.
Inside panel passenger side under dash by door.
Get the computer scanned to see what the problem is.
the computer tells it to glow.
There are many causes for a service engine light. You need to have it checked for codes. Then you can diagnose from there.
The service engine soon light comes on when the computer detects a malfunction and sets a code. see related questions below for more info.