Black Exhaust Smoke and Performance Issues with 2014 Dacia Sandero: Seeking Advice and Experiences

Hey everyone, I'm dealing with a bit of a problem with my 2014 Dacia Sandero, petrol engine, she's done 135,812 KM so far. I'm noticing black smoke from the exhaust when I put my foot down, and my engine light's stayed on. It's also been starting slower on cold mornings, and there's a distinct drop in power when I'm out and about, alongside some jerking on acceleration. To top it all off, she's guzzling way more fuel than usual, and something smells off with the exhaust fumes. I've been thinking maybe it's something to do with the fuel pressure sensor, but I'm not an expert. I'd rather have an idea of what I could be dealing with before heading back to my mechanic since I didn't have the best experience with him last time. Has anyone here had something similar and can share their experiences and how their mechanic handled it? Thanks in advance for your suggestions.

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