Grandland X diesel engine power loss smoke

I have a Vauxhall Grandland X as well, though I'm running a petrol engine. I did have similar symptoms of power loss and smoke a while back. Turned out to be a faulty sensor related to the fuel efficiency system. Have you checked for any error codes? It might be worth looking into before assuming it's the DPF.

Thanks for the quick response! I haven't checked for error codes myself, to be honest. I'm not sure how to do that. Could a sensor fault really cause that much smoke? I was reading online about DPF cleaning and filter replacement, which sound pretty expensive.

Yes, a faulty sensor can definitely cause those symptoms. I was surprised too! Though since you're seeing smoke with a diesel engine, a blocked DPF is a very real possibility and those can cause serious issues. Considering your mileage and the symptoms, it might be time to visit a workshop. They'll be able to diagnose the problem accurately and give you a quote.

Okay, I appreciate the advice. I'll take it to a workshop and get it checked out properly. It turns out my worries were right: the DPF was indeed defective. The total repair cost, including a new filter, came to 1550€. Thanks again for your help!