Fluence cylinder 3 misfire

I understand that you are experiencing combustion misfires. Have you checked the error codes using an OBD2 scanner? Knowing the specific cylinder affected by the misfire could help narrow down the possibilities. You could also check the fuel injectors.

Yes, I used an OBD2 scanner, and it indicated misfires on cylinder 3. How can I determine if the fuel injector on that cylinder is faulty?

With a P0303 error code, it is quite probable you are looking at a defective injector. You can try switching the injector from cylinder 3 with another cylinder and see if the misfire moves. However, I would suggest taking your car to a workshop. They have better diagnostic tools to properly asses the situation.

Thanks for the insight. I took it to a local shop, and they confirmed it was a defective fuel injector on cylinder 3, as you suspected. The repair cost me 515€. The car runs smoothly now!