How do I diagnose engine problems in a Ford Focus?

I've noticed some strange noises and reduced performance in my Ford Focus. How can I identify and fix any engine issues?

It's always best to start by checking your spark plugs and wires for any signs of wear or damage. If those seem fine, then it's possible that your fuel filter needs to be replaced. If you're still having issues after that, it may be time to take your car to a mechanic for a deeper diagnostic.

One common cause of engine problems in Ford Focus is a faulty ignition coil. You can use a multimeter to check the resistance of the coil and make sure it falls within the manufacturer's specifications. If it's significantly higher or lower, it's time for a replacement.