How do I troubleshoot the transmission on my Ford Focus?

I recently purchased a used Ford Focus and I'm noticing some issues with the transmission. Sometimes, it will shift gears harshly and other times it will struggle to shift at all. What could be causing this issue and how can I fix it?

First, check the transmission fluid level. If it's low, top it off and see if that resolves the issue. If not, it could be a more serious problem such as a faulty solenoid or damaged gears.

I had a similar issue with my Ford Focus and it turned out to be a problem with the transmission control module. I would recommend bringing it to a certified Ford mechanic for a proper diagnosis.

Make sure you're regularly getting your transmission fluid flushed and changed according to the manufacturer's recommendations. Neglecting this can lead to transmission issues.