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.
Need more info check engine light on?trouble codes?year ?
If your check engine light is on then check for the code and find out whats its about. It can also be a short in the wiring harness.
After reading the code, fixing the cause, you clear the code with a scan tool.
Code P0731 means A/T first gear signal fault
If the light comes on there is a code. Have the code checked and fix the cause. If the light is on with no codes, then you have a computer problem.
You dont they are meant to be in the car for the life of the engine. But you can buy a timing light and check the timing.
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what causes the engine light and the tcs and slip light to come on
the check engine light is blinking and my 03 Nissan exterra is running rough
car wont start cant jump start AT Check light comes on