How do I troubleshoot engine issues in my Vauxhall Vivaro?

I've noticed my Vauxhall Vivaro is experiencing engine issues, such as strange noises and a decrease in performance. What steps should I take to diagnose and fix the problem?

First, check the fuel system for any clogs or leaks. Also, make sure the air filter is clean and that the spark plugs are in good condition. It may also be helpful to run a diagnostic test using a code reader.

If the issue persists, it could be a problem with the engine itself. You may need to take it to a mechanic for further inspection and potential repairs. It's important to address engine issues as soon as possible to avoid further damage.

Another possible cause could be related to the transmission or drivetrain. It's possible that a component is worn out or malfunctioning, causing the engine to perform poorly. It's best to have a professional take a look at these systems to determine the exact issue.