What are the most common Ford Fiesta engine problems?

I recently bought a used Ford Fiesta and I've been experiencing some issues with the engine. It's not running as smoothly as I would like and there's a strange noise coming from under the hood. What could be causing these problems and how can I fix them?

It's likely that your Fiesta's engine is experiencing misfires. This can be caused by a variety of factors, including spark plug issues, fuel system problems, or even a faulty ignition coil. I recommend taking your car to a trusted mechanic for a diagnostic test to pinpoint the exact issue.

Another common issue with the Fiesta's engine is a faulty oxygen sensor. This can lead to poor fuel efficiency and a rough idle. It's important to get this fixed as soon as possible, as it can also cause damage to other engine components if left untreated.

If you're noticing a jerking or hesitation while accelerating, it could be due to a clogged fuel filter. This is a relatively easy fix that you can do yourself, but if you're not comfortable with car maintenance, it's best to take it to a professional.