What causes hesitation in my Vauxhall Vivaro's engine?

I've been experiencing some hesitation when accelerating in my Vauxhall Vivaro. It's especially noticeable when going uphill or starting from a stop. What could be causing this issue?

It's possible that there is a problem with your fuel system. Check your fuel filter and injectors for any clogs or build up that may be affecting your engine's performance. It may also be worth getting a fuel system cleaner to see if that helps.

Another potential cause could be a faulty oxygen sensor. This can cause your engine to run too rich or too lean, leading to hesitation. Have a mechanic check your oxygen sensor to see if it needs to be replaced.

If your Vauxhall Vivaro is equipped with a turbocharger, the hesitation could be due to a worn out turbo. In this case, getting the turbo rebuilt or replaced may solve the issue.

You may also want to check the spark plugs and ignition coils. If they are worn out or damaged, they can cause hesitation and other engine performance issues. Try replacing them and see if the problem improves.