It means your engine is not running properly for some reason.
What you have to do now is have a scan tool connected to the car to read what fault code(s) are stored.
Once you know the code you can determine how severe the fault is and what it will cost to put right.
It could just be something simple as a split vacuum hose or it could be you require a new sensor of some type.
Unfortunately, these things cant be guessed, you need the scan tool to verify what is at fault.
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