DS3 Engine Running Rough

I had a similar experience with my DS3. Does the engine misfire specifically when it's cold, or is it constant? If it's more noticeable when the engine is cold, it could indicate an issue with the air-fuel mixture or even a vacuum leak. Check the basics first – air filter, spark plugs. I've also seen issues with ignition coils causing misfires in these engines. Do you have any idea what the error code says?

Thanks for the info! It seems to happen all the time, not just when it's cold. I haven't checked the error code yet. Where should I start looking for the air-fuel mixture problem or vacuum leak?

Given that it's happening constantly, I would advise against driving it for too long. Continued operation with a misfire can damage the catalytic converter. Since you are not familiar with diagnostic procedures, I would suggest that you bring your vehicle to a certified repair shop, read out the error code and have it analyzed by a professional. In my case, the error code pointed to a leak in the exhaust system. They charged me around 265€ for fixing it.

Okay, thanks for the advice. I took it to the workshop, and you were spot on! It was a leak in the exhaust system. Got it fixed for 265€, and it's running smoothly now.