The problem was not fixed with a tune up, or the light is on because it was not reset by the service station.
It doesn't automatically go off just because you have it serviced or something. They actually need to be reset manually after it comes on.
what causes the rear lights to stay on while engine is running. the car is park
A malfunctioning sensor can cause the service engine light to stay on. A glitch in the computer can also cause the light to stay on.
There are dozens and dozens of causes for the check engine light to stay on. You need to have the computer checked for codes to know possible causes.
Yes. Your Check Engine light or Service Engine Soon light.
Could be a bad ABS sensor. Needs service/replacement.
Bad sending unit
A mechanic can reset the service engine soon light on a 1999 Mustang GT. If the light continues to stay on after visiting a mechanic unplugging the battery for a few minutes may get it to stay off.
Any problem with the car that affects its emissions will cause the light to come on and stay on until the problem has been fixed. (There are literally dozens of possible causes.)
its missing 4 cylinders sir!
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.
Thousands of things. Take it to a mechanic who has a scanner and they can tell you what the problem is.