Seeking Advice on Black Smoke, Engine Warning and DPF Regeneration Failure in 2005 Kia Carnival

Hey there! I've got a 2005 Kia Carnival, diesel engine with 24,293 KM mileage. Lately, it's been showing a few concerning signs like black smoke from the exhaust when accelerating, check engine light popping on, drop in power and a hefty dose of strong exhaust smell. The flavor on top is the failed DPF regeneration. I'm leaning towards an issue with the particulate filter efficiency being too low. Previously, I had a rough patch with my last mechanic, so I'm keen on getting some firsthand advice here. Has anyone experienced similar issues with their vehicles? How did you manage it? Any recommendations for a reliable mechanic who can help me out? Your insights would be greatly appreciated!

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