What are the common issues with the Ford S-Max engine?

I recently purchased a used Ford S-Max and I'm starting to experience some issues with the engine. The check engine light keeps coming on and the car has been shaking while idling. I've tried getting it fixed but the issue still persists. What could be causing these problems and what steps should I take to fix them?

It's possible that there could be an issue with the spark plugs or ignition coils. It's best to take your car to a mechanic and have them do a diagnostic check to pinpoint the exact issue.

I had a similar issue with my Ford S-Max and it turned out to be a faulty oxygen sensor. Once I replaced it, the check engine light went off and the car stopped shaking.

I would suggest checking the fuel injectors as well. Dirty or clogged fuel injectors can cause engine misfires and result in the issues you are experiencing.