How to troubleshoot a faulty engine on a Vauxhall Vivaro?

When driving my Vauxhall Vivaro, I have noticed a decrease in engine performance and occasional misfires. What could be the cause of this issue and how can I fix it?

The problem could be due to a clogged fuel filter. Try replacing it and see if it improves the engine performance.

It could also be caused by a faulty spark plug. Check and replace any damaged spark plugs to see if it improves the misfires.

Another common issue with Vauxhall Vivaro engines is a malfunctioning oxygen sensor. Consider replacing it if you continue to experience performance issues.

If none of these solutions work, it may be a more serious issue such as a damaged catalytic converter. It's best to take your vehicle to a certified mechanic for a proper diagnosis and repair.