How do I troubleshoot a faulty engine in my Vauxhall Astra?

My Vauxhall Astra's engine is making strange noises and not running smoothly. What steps can I take to diagnose and fix this issue?

First, check for any error codes using a diagnostic tool. If there are none, start by inspecting the spark plugs and air filter. Clean or replace them if needed.

If the issue persists, it could be a fuel delivery problem. Check the fuel pump and fuel injectors for any issues or clogs.

It's also important to regularly maintain your engine, such as changing the oil and oil filter, to prevent these types of issues.

If all else fails, it's best to take your Vauxhall Astra to a trusted mechanic for a thorough inspection and repair.