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The emission light being on, would suggest a fault in the emission control system (or depollution system).
That could be anything from oxygen sensor to catalytic converter, or it can even be a wrongfully triggered fault.
To find out, you need to have the car scanned, retrieve the codes, and erase them.
If the light does not come back, then it would be a sporadic error, and the car is fine.
If the light comes back, then the error codes retrieved, would point out which system or component needs replacing.