There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
I reset the check engine light on my jeep by disconnecting it from the battery.
Fix the problem causing them to be on.
There are dozens of codes. Be specific as to what code you are getting.
You will have to take the dash apart and replace the bulb.
i unhooked the battery...(both terminals)
common problem with 1998 mystique check engine light on
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
my check engine light is on on start up truck runs great after wormed up runs rough
Any failure that can increase tailpipe emissions.
The check engine light is the light shaped like an engine, or the light that states Check Engine (Soon). If this light comes on, it is time to see what the issue is with the engine.
The idle speed is NOT adjustable it is computer controled. Is the check engine light on ? if so then you MUST have the engine scanned with an engine scanner to see what is wrong.
If the check engine light is blinking , an engine cylinder misfire has been detected