Modern Vespa

Hello everyone
While I was preparing the 250cc mp3 engine for the season, I carelessly broke the electric injector with my hand. This is usually standard on this model. I replaced the injector with an aftermarket with similar model (3 holes). Now, after 10 minutes of driving, the check engine starts. After starting the engine on and off, the light goes out.
I checked the battery charge with the instrument and it is in the range of 14.4V. The engine runs without problems, only a little idle gas varies, which is probably due to the injector. I'm not sure that our service has a computer for checking the code.
Lambda sonde connectors are also fine. What else could be the problem?
Do you have any idea. H
Thanks everyone, thanks in advance..
Best Ćule

Replace with the correct factory injector.